This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antibiotics, Subject name: Pharmacology
The drug of choice for secondary syphilis? 
Select and explain. 
A. Chloramphenicol, B. Benzathine penicillin, C. Doxycycline, D. Vancomycin
B: Benzathine penicillin
Answer: B: Benzathine penicillin 
Explanation: Penicillins are the drug of choice for syphilis.Ref: KDT 5th ed Pg:657