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': 'Sympathetic system has adrenergic nerve endings at all sites except? \nSelect and explain. \nA. Hea, B. Blood vessels in skeletal muscles, C. Eye, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Blood vessels in skeletal muscles(Ref: Principles of medical physiologY p. 241Sympathetic adrenergic fibers are those which secrete endogenous catecholamines (either adrenaline, nor-epinephrine / nor-adrenaline or dopamine)Some sympathetic fibers do not secrete catecholamines but secrete acetylcholine -Sweat glandsBlood vessels in skeletal muscles", 'role': 'assistant'}]