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
[{'content': 'True about nitric oxide \nSelect and explain. \nA. Formed from L-Arginine by NO synthase, B. Causes vasodilation in all vessels, C. Used in poal hypeension, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]