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
Ondansetron is a potent : 
Select and explain. 
A. Antiemetic, B. Anxiolytic, C. Analgesic, D. Antidepressant
A: Antiemetic
Answer: A: Antiemetic 
Explanation: None