This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Which of the following drug is bactericidal? \nSelect and explain. \nA. Sulfonamides, B. Erythromycin, C. Chloramphenicol, D. Cotrimoxazole', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Primarily bactericidal: Penicillins Cephalosporins Aminoglycosides Vancomycin Polypeptides Nalidixic acid Rifampin Ciprofloxacin Isoniazid Metronidazole Pyrazinamide Cotrimoxazole ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:669', 'role': 'assistant'}]