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: Pharmacology
[{'content': 'Muscarinic receptors on blood vessel endothelium cause \nSelect and explain. \nA. Vasodilatation through acetylcholine, B. Vasodilatation through NO, C. Vasoconstriction through acetylcholine, D. Vasoconstriction through endotheline', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b' i.e., Vasodilatation through NONo direct cholinergic supply is present in blood vessels.But cholinergic receptor (M, types) are present on blood vessels endothelium.Stimulation of these receptors causes release of EDRF (NO) from endothelium resulting in vasodilatation.", 'role': 'assistant'}]