This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-HIV Drugs, Subject name: Pharmacology
[{'content': 'All of the following drugs are HIV protease inhibitors except? \nSelect and explain. \nA. Indinavir, B. Abacavir, C. Atazanavir, D. Ritonavir', 'role': 'user'}, {'content': "Answer: B \nExplanation: Drugs ending with 'NAVIR' are HIV protease inhibitors. Abacavir is a nucleoside reverse transcriptase inhibitor of HIV", 'role': 'assistant'}]