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
Drug of choice for treponema is: 
Select and explain. 
A. Pencillin, B. Tetracycline, C. Azithromycin, D. Doxycycline
A: Pencillin
Answer: A: Pencillin 
Explanation: Pencillin