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
All of the following are useful in the intravenous therapy for hypertensive emergencies except: 
Select and explain. 
A. Fenoldopam, B. Urapidil, C. Enalaprilat, D. Nifedipine
A: Fenoldopam
Answer: A: Fenoldopam 
Explanation: None