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
[{'content': 'Misoprostol is a \nSelect and explain. \nA. Prostaglandin E1 analogue, B. Prostaglandin E2 analogue, C. Prostaglandin antagonist, D. Antiprogestin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Natural prostaglandin in body is PG E2 whereas Misoprostol and alprostadil are synthetic prostaglandins which are PG E1 analogues. Refer kDT 6/e p181', 'role': 'assistant'}]