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: Medicine
Which of the following vasopressors woul be preferred in a patient with aortic stenosis 
Select and explain. 
A. Ephedrine, B. Dopamine, C. Dobutamine, D. Phenylephrine
D: Phenylephrine
Answer: D: Phenylephrine 
Explanation: None