This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following is not pa of control measures for diphtheria- \nSelect and explain. \nA. Treatment of cases with antitoxin and erythromycin, B. Treatment of carriers with antitoxin, C. Isolation of cases, suspected cases and carriers, D. Regular immunization under-fives', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The carriers should be treated with 10 days course of oral erythromycin, which is the most effective drug for the treatment of carriers . Ref:PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page :161', 'role': 'assistant'}]