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: Gynaecology & Obstetrics
All are tocolytics except : 
Select and explain. 
A. Ritodrine, B. Terbutaline, C. Misoprostol, D. Nicardipine
C: Misoprostol
Answer: C: Misoprostol 
Explanation: Misoprostol