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: Skin
[{'content': 'Drug of choice for syphilis in a pregnant women \nSelect and explain. \nA. Azithromycin, B. Penicillin, C. Tetracycline, D. Ceftriaxone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Penicillin Penicillin is the only recommended agent for treatment of syphilis in pregnancyQ. If the patient has a documented penicillin allergy, desensitization and penicillin therapy should be given.', 'role': 'assistant'}]