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': 'The following may be used in erectile dysfunction except - \nSelect and explain. \nA. Phenylephrine, B. Apomorphine, C. Alprostidil, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Phenylephrine Drugs used in erectile dysfunction Phosphodiesterase-5 inhibitors (Siledenafil, Todafil, Vardenafil). Alprastadil (Prostaglandin El) Papaverine Androgens Apomorphine", 'role': 'assistant'}]