This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
The HIV fusion inhibitor, enfuviide, acts at the site of: 
Select and explain. 
A. Gp 120, B. Gp 41, C. P24, D. CXCR4
B: Gp 41
Answer: B: Gp 41 
Explanation: ENFUVIIDE: This HIV derived synthetic peptide acts by binding to HIV-1 envelope transmembrane glycoprotein(gp 41) which is involved in fusion of viral and cellular membranes. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SEVENTH EDITION PAGE NO:811