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
Misoprostol is a - 
Select and explain. 
A. Prostaglandin E1 analogue, B. Prostaglandin E2 analogue, C. Prostaglandin antagonist, D. Antiprogestin
A: Prostaglandin E1 analogue
Answer: A: Prostaglandin E1 analogue 
Explanation: Ans. is 'a' i.e., Prostaglandin El analogue Misoprostol is a stable analogue of Prostaglandin E1 - KDT