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, a prostaglandin analogue is useful as : \nSelect and explain. \nA. Uterine relaxant, B. Anti–ulcer, C. Bronchodilator, D. Vasodilator', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]