This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Medicine
[{'content': 'Drug of choice for diphtheria carrier is: \nSelect and explain. \nA. Penicillin, B. Erythromycin, C. Procaine penicillin, D. Tetracycline', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' Erythromycin Drug of choice for diptheria carrier is erythromycin.", 'role': 'assistant'}]