This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Anaerobic streptococci; which is the most effective - \nSelect and explain. \nA. Penicillin, B. Clindamycin, C. Vancomycin, D. Erythromycin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Clindamycin Amongst the given options, clindamycin is most active against anaerobes.", 'role': 'assistant'}]