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': 'Alprostadil is not used for - \nSelect and explain. \nA. Erectile dysfunction, B. Pulmonary hypeension, C. Patent ductus aeriosus, D. Critical limb ischemia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Patent ductus aeriosus o Alprostadil is used to keep the ductus open and not to treat patent ductus aeriosus.", 'role': 'assistant'}]