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
The minimum period required for post-exposure chemoprophylaxis for HIV is : 
Select and explain. 
A. 4 weeks, B. 6 weeks, C. 8 weeks, D. 12 weeks
A: 4 weeks
Answer: A: 4 weeks 
Explanation: None