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: Social & Preventive Medicine
[{'content': 'Drug of choice for treatment of leptospirosis is: \nSelect and explain. \nA. Penicillin, B. Ampicillin, C. Tetracycline, D. Doxycycline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Penicillin is the drug of choice for treatment of leptospirosis. Other drugs used are tetracycline and doxycycline. Ref: Park 21st edition, page 267.', 'role': 'assistant'}]