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: Microbiology
[{'content': 'Drug of choice for carriers of diphtheria is ? \nSelect and explain. \nA. Penicillin, B. Septran, C. Tetracycline, D. Erythromycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is i.e., Erythromycin . Erythromycin is more active than penicillin in the treatment of carriers.', 'role': 'assistant'}]