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
[{'content': 'Misoprostol is an analogue of: \nSelect and explain. \nA. PGE1, B. PGE2, C. PGF2, D. PGI2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]