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
Dosage of benzyl penicillin in treatment of primary syphiis is - 
Select and explain. 
A. 1.2 MU single i.m., B. 1.2 MU single i.v., C. 2.4 MU single i.m., D. 4.8 MU single i.m.
C: 2.4 MU single i.m.
Answer: C: 2.4 MU single i.m. 
Explanation: Ans. is 'c' i.e., 2.4 MU single i.m.