You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Brand", "UnapprovedDrug", "Drug", "DrugGroup"].

Please return the output as a JSON object of the format: {"Brand" : ["Aspirin", ...], "DrugGroup": ["Salicyclate", ...], "Drug": ["Phenobarbital", ...], "UnapprovedDrug": ["Heroin", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Nephrotoxicity has been reported following concomitant administration of cephalosporins with aminoglycoside antibiotics or potent diuretics such as furosemide. Renal function should be carefully monitored, especially if higher dosages of the aminoglycosides are to be administered or if therapy is prolonged, because of the potential nephrotoxicity and ototoxicity of aminoglycosidic antibiotics. Nephrotoxicity and ototoxicity were not noted when ceftazidime was given alone in clinical trials. Chloramphenicol has been shown to be antagonistic to beta-lactam antibiotics, including ceftazidime, based on in vitro studies and time kill curves with enteric gram-negative bacilli. Due to the possibility of antagonism in vivo, particularly when bactericidal activity is desired, this drug combination should be avoided. Drug/Laboratory Test Interactions The administration of ceftazidime may result in a false-positive reaction for glucose in the urine when using CLINITEST  tablets, Benedicts solution, or Fehlings solution. It is recommended that glucose tests based on enzymatic glucose oxidase reactions (such as CLINISTIX  or TES-TAPE ) be used.
{"Brand": [], "Drug": ["Chloramphenicol", "ceftazidime", "furosemide"], "DrugGroup": ["aminoglycosidic antibiotics", "diuretics", "beta-lactam antibiotics", "aminoglycoside antibiotics", "cephalosporins", "aminoglycosides"], "UnapprovedDrug": []}