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: Gynaecology & Obstetrics
[{'content': 'Treatment recommended for secondary syphilis is \nSelect and explain. \nA. Benzathine penicillin G 2.4 mIU i.m weekly, 3 doses, B. Benzathine penicillin G 2.4 mIU i.m single dose, C. Benzathine penicillin G 2.4 mIU i.m twice weekly, 4 doses, D. Benzathine penicillin G 2.4 mIU i.m twice daily for 2 weeks.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]