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': 'Drug of choice for treponema is: \nSelect and explain. \nA. Pencillin, B. Tetracycline, C. Azithromycin, D. Doxycycline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pencillin', 'role': 'assistant'}]