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: Medicine
Worldwide accepted minimum dose of penicillin in latent syphilis- 
Select and explain. 
A. 4.8 mega units, B. 6.0 mega units, C. 7.0 mega units, D. 10 units
C: 7.0 mega units
Answer: C: 7.0 mega units 
Explanation: None