This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: D.O.C, Subject name: Pharmacology
[{'content': 'Drug of choice for syphilis: \nSelect and explain. \nA. Benzathine Penicillin, B. Penicillin, C. Tetracycline, D. Ciprofloxacin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Benzathine penicillinBenzathine penicillin 2.4 million units is drug of choice for syphilis. Alternatively, procaine penicillin can also be given. Ciprofloxacin can be given in UTI, respiratory tract infections, acute diarrhea. Cefixime is also indicated in UTI, respiratory infections. Tetracyclines are the drug of choice for rickettsial and chlamydial infection.', 'role': 'assistant'}]