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
A 70 years old male develops pneumonia and septicaemia. Patient goes into renal failure and has a B.P of 70/50 mm of Hg. Drug that should be used to maintain B.P is 
Select and explain. 
A. Adrenaline, B. Ephedrine, C. Phenylephrine, D. Nor epinephrine
D: Nor epinephrine
Answer: D: Nor epinephrine 
Explanation: None