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
Which among the following anti-HIV drugs is an inhibitor of viral fusion? 
Select and explain. 
A. Enfuvirtide, B. Nelfinavir, C. Efavirenz, D. Etanercept
A: Enfuvirtide
Answer: A: Enfuvirtide 
Explanation: None