You will be shown a paragraph from a biomedical research article. Your task is to extract all drug combinations appearing in a specific sentence within in the paragraph. Each drug combination should be assigned to one of the following three categories:

- POS: Indicates a positive interaction between the drugs in the combination; for instance, drugs that have an additive or synergistic effect.
- NEG: Indicates a negative interaction between the drugs in the combination; for instance, combining these drugs might result in adverse side effects, or might reduce their efficacy.
- COMB: Indicates that the drugs are given in combination, but the type of interaction between the drugs cannot be determined based on the provided context.

Please format your answer as a json array. Each entry in the array should itself be an array formatted as [<drug_1>, <drug_2>, ..., <drug_n>, <category>] where <category> is one of the three categories listed above and <drug_1>, ..., <drug_n> are drug names copied verbatim from the input sentence. Different combinations may involve different numbers of drugs; in other words, the `n` in <drug_n> may vary.

As an example, the following output describes two extracted drug combinations; one between two drugs, and one between three drugs:

[["artesunate", "artemether", "COMB"], ["Nifedipine", "Labetalol", "Prazosin", "POS"]]

The paragraph and specific sentence are below. You should only extract relationships expressed in the specific sentence; the paragraph is provided for context.

In your output, return only the json array and no other text. If no drug combinations appear, return an empty array `[]`.

paragraph: [Current drugs for the treatment of tropical malaria]. The occurrence in the early 60's of stable resistance to chloroquine among Plasmodium falciparum strains in the Amazonas and on the Thai-Cambodian border has been a shock for all malariologists. This led to the search for new antimalarials without cross resistance with chloroquine. For each new drug, one of the major concerns was to define how rapidly parasites would develop resistance to this compound. Drug combinations were taken into consideration so as to achieve a delay in the appearance of resistance. The decision to test a triple combination has led to the development of Fansimef , a fixed combination with tablets containing 250 mg mefloquine , 500 mg sulfadoxine and 25 mg pyrimethamine . A very relevant delay in the development of resistance was found both in-vivo--in the P. berghei model--and in-vitro using P. falciparum. Fansimef has also been under investigations for malaria. Controlled clinical trials were performed in Africa, South America and South East Asia. The documentation for this new indication will be submitted to registration authorities in 1991. A preference alternative to continuous chemoprophylaxis is stand-by malaria treatment for travellers to regions where the malaria risk is relatively low. Stand-by treatment is under investigations in France and in Switzerland. In the search for alternative remedies against drug resistant P. falciparum malaria our attention was directed to Yingzhaosu, a new sesquiterpene peroxide of plant origin from traditional Chinese medicine. A short and convenient synthesis of this ring system gave access to a variety of structural analogues of Yingzhaosu.(ABSTRACT TRUNCATED AT 250 WORDS)

sentence: The decision to test a triple combination has led to the development of Fansimef , a fixed combination with tablets containing 250 mg mefloquine , 500 mg sulfadoxine and 25 mg pyrimethamine .
[["mefloquine", "sulfadoxine", "pyrimethamine", "POS"]]