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: [Viral hepatitis B in a patient with follicular lymphoma treated with biological therapy]. Reactivation, recurrence or acute infection with hepatitis B virus (HBV) represent severe complications of biological therapy. Reported is a case of a 58-year-old female treated in the past with cytostatics and rituximab for follicular lymphoma , in whom HBV infection was detected during a follow-up of the contacts of her partner diagnosed with acute viral hepatitis B. At the beginning , the patient had a very high serum level of HBV DNA ( 4.3 × 108 IU/mL ) and therefore she was treated with combined antiviral therapy ( lamivudine and tenofovir ) . After 10 months, the serum level of HBV DNA decreased significantly (3,100 IU/mL) and the combined antiviral therapy was switched to monotherapy with tenofovir. Another 5 months later, the serum level of HBV DNA was only 950 IU/mL. This case demonstrates important clinical problems connected with HBV infection in immunocompromised persons.

sentence: Reported is a case of a 58-year-old female treated in the past with cytostatics and rituximab for follicular lymphoma , in whom HBV infection was detected during a follow-up of the contacts of her partner diagnosed with acute viral hepatitis B. At the beginning , the patient had a very high serum level of HBV DNA ( 4.3 × 108 IU/mL ) and therefore she was treated with combined antiviral therapy ( lamivudine and tenofovir ) .
[["lamivudine", "tenofovir", "POS"]]