This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
Which of the following binds to viral envelope glycoprotein preventing the conformational changes required for the fusion of viral and Cellular membranes 
Select and explain. 
A. Avacavir, B. Indunavir, C. Enfuviide, D. Osltamivir
C: Enfuviide
Answer: C: Enfuviide 
Explanation: Ref-KDT 6/e p774 It is a fusion inhibitor useful in the treatment of HIV infection