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: Dental
DOC in primary syphillis is – 
Select and explain. 
A. Corticosteroid, B. Oral penicilline, C. Benzathine penicilline, D. Crystalline penicilline
C: Benzathine penicilline
Answer: C: Benzathine penicilline 
Explanation: Benzathine penicillin is the drug of choice for primary, secondary, latent and tertiary syphilis (except for neurosyphilis). For neurosyphilis aqueous penicillin G is the drug of choice.