This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Viral, Subject name: Pharmacology
[{'content': 'Which of the following is not a protease inhibitor? \nSelect and explain. \nA. Atazanavir, B. Ritonavir, C. Abacavir, D. Indinavir', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) AbacavirRef.: KDT 6th ed. / 773-74Protease inhibitors (ends with "navir")Nucleoside reverse tanscriptase inhibitor (NRTI)* Indinavir* Saquinavir* Ritonavir* Atazanavir* Nelfinavir* Amprenavir* Lopinavir* Zidovudine* Stavudine* Lamivudine* Didanosine* Emtricitabine* Zalcitabine* AbacavirSide effect: Lipodystrophy syndromeMinimum side effect seen with: ATAZANAVIRSide effect: acute pancreatitis* Peripheral neuropathy* Bone marrow suppression and M.I.Also Know* NRTI which has the maximum risk of acute pancreatitis: DIDANOSINE* NRTI which has the maximum risk of peripheral I neuropathy: STAVUDINE* Safest NRTI: LAMIVUDINE (minimal risk of pancreatitis and peripheral neuropathy)', 'role': 'assistant'}]