This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Drug of choice for anaerobic infection is \nSelect and explain. \nA. Amphotericin B, B. Metronidazole, C. Aminoglycoside, D. Macrolide', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Metronidazole * Metronidazole is a prototype nitroimidazole which has broad spectrum cidal activity against the anaerobic micro-organisms including giardia lamblia.* It doesn't affect the aerobic bacteria.* It is selectively toxic to anaerobic and micro-aerophilic micro-organisms.* In anerobic conditions, it produces highly cytotoxic nitro radical which is attenuated in aerobic environment.* It also induces mutagenesis and cause radiosensitization.* Aminoglycosides are active only against aerobes.* Amphotericin B is an anti-fungal agent.", 'role': 'assistant'}]