This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Drug of choice for syphilis during pregnancy is \nSelect and explain. \nA. Ampicillin, B. Erythromycin, C. Benzathine penicillin, D. Tetracyclines', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. c (Benzathine penicillin). (Ref. KD Tripathi - 4th/ 741, 751; William's Obstetrics - 780)# Penicillin is DOC during pregnancy as it also protects the newborn from developing syphilis.# If patient is allergic to penicillin, desensitize the patient & give penicillin (not erythromycin).DOC for syphilisPenicillinAlternative to penicillinErythromycinDuring pregnancyDOC (even if patient is allergic to penicillin) is Penicillin. (Because erythromycin never protect baby from developing syphilis)", 'role': 'assistant'}]