This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Which of the following drug is not used for the treatment of hypeensive emergencies \nSelect and explain. \nA. Phentolamine, B. Fenoldopam, C. Sod.Nitroprusside, D. Enalapril', 'role': 'user'}, {'content': "Answer: D \nExplanation: Enalaprilat is an active form/metabolite of enalapril, an ACE inhibitor. Enalaprilat is used for hypeensive emergencies due to the rapid onset of action. Enalapril isn't used as it 1st has to get activated.Ref: Katzung 10th ed, pg 145", 'role': 'assistant'}]