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
Docasanol is used as: 
Select and explain. 
A. Antifungal, B. Antiviral, C. Analgesic, D. Antiemetic
B: Antiviral
Answer: B: Antiviral 
Explanation: 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.