This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, 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: Natural prostaglandin in body is PG E2 whereas Misoprostol and alprostadil are synthetic prostaglandins which are PG E1 analogues. Refer kDT 6/e p181