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: Pharmacology
[{'content': 'Only drug used in pregnancy with syphilis ? \nSelect and explain. \nA. Penicillin, B. Clinadmycin, C. Azithromycin, D. Erythromycin', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is'a'i.e., Penicillin[Ref: Harrisons 18th/e p. 1j871Management of Syphilis in Pregnancy:Penicillin is the only recommended agent for the treatment of syphilis in pregnancy.If the patient has a documented penicillin allergy, desensitization and penicillin therapy should be undeaken according to the CDC's 2010 guidelines.", 'role': 'assistant'}]