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. PGE,, B. PGE2, C. PGF2a, D. PGI2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: PGE1 REF: Goodman and Gillman\'s 11TH edition page 626 "Misoprostol (15-deoxy-16-hydroxy-16-methyl-PGE1; CYTOTEC) is a synthetic analog of PGE1"', 'role': 'assistant'}]