This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Docasanol is used as: \nSelect and explain. \nA. Antifungal, B. Antiviral, C. Analgesic, D. Antiemetic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Docosanol is a saturated 22-carbon aliphatic alcohol that inhibits fusion between the plasma membrane and the HSV envelope, thereby preventing viral entry into cells and subsequent viral replication. Ref: Katzung 11th edition Chapter 49.', 'role': 'assistant'}]