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
All of the following drug is a reverse transcriptase inhibitor 
Select and explain. 
A. Indinavir, B. Ritonavir, C. Nelfinavir, D. Abacavir
D: Abacavir
Answer: D: Abacavir 
Explanation: Refer KDT 6/e p772 All drugs ending with navir are protease inhibitors. Abacavir is an NI