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
[{'content': 'Following drugs act against HIV-2 Except: \nSelect and explain. \nA. Ritonavir, B. Tenofovir, C. Eirenz, D. Zalcitabine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nevirapine (NVP) and Eirenz (EFV): These are nucleoside unrelated compounds which directly inhibit HlV reverse transcriptase without the need for intracellular phosphorylation. Their locus of action on the enzyme is also different. They are more potent than AZT on HIV -1, but do not inhibit HIV -2. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:772', 'role': 'assistant'}]