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 HIV fusion inhibitor, enfuvirtide, acts at the site 
Select and explain. 
A. Gp 120, B. Gp 41, C. P24, D. CXCR4
B: Gp 41
Answer: B: Gp 41 
Explanation: None