This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Specific Infections, Subject name: Gynaecology & Obstetrics
[{'content': 'Drug of choice in pregnant women with Secondary Syphilis is? \nSelect and explain. \nA. Doxycycline, B. Benzathine Penicillin, C. Ceftriaxone, D. Cotrimoxazole', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Benzathine PenicillinRef: Danforth's Obstetrics and Gynecology, lOthed p 613", 'role': 'assistant'}]