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: Physiology
[{'content': 'Regarding nitric oxide false is \nSelect and explain. \nA. Derived from endothelium, B. Acts by increasing c–AMP levels, C. Vasodilator, D. Derived from arginine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nitric oxide is formed from Arginine, released from endothelial cells and acts through cGMP to cause vasodilation.', 'role': 'assistant'}]