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
Tegaserod is a 
Select and explain. 
A. 5HT3 antagonist, B. D2 antagonist, C. 5HT4 agonist, D. NK1 antagonist
C: 5HT4 agonist
Answer: C: 5HT4 agonist 
Explanation: Cisapride, Mosapride, Prucalopride and Tegaserod are 5HT4 agonists used as prokinetics in constipation.
Tegaserod is withdrawn from market because of increased risk of myocardial infarction & stroke.