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: Anaesthesia
True about nitric oxide 
Select and explain. 
A. Formed from L-Arginine by NO synthase, B. Causes vasodilation in all vessels, C. Used in poal hypeension, D. All
D: All
Answer: D: All 
Explanation: A i.e. Formed from L-arginine by NO Synthetase; B i.e. Causes vasodilation of all vessels; C i.e. Used in poal hypeension