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: Dental
[{'content': 'DOC in primary syphillis is – \nSelect and explain. \nA. Corticosteroid, B. Oral penicilline, C. Benzathine penicilline, D. Crystalline penicilline', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Benzathine penicillin is the drug of choice for primary, secondary, latent and tertiary syphilis (except for neurosyphilis). For neurosyphilis aqueous penicillin G is the drug of choice.', 'role': 'assistant'}]