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: Skin
DOC in primary syphillis is 
Select and explain. 
A. Coicosteroid, B. Oral Penicilline, C. Benzathine Penicilline, D. Crystalline Penicilline
C: Benzathine Penicilline
Answer: C: Benzathine Penicilline 
Explanation: C i.e. Benzathine penicillin