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': 'Acetylcholine on respiratory tract acts by all except? \nSelect and explain. \nA. Bronchoconstriction, B. Increases secretion, C. Stimulates chemoreceptor of aoic body, D. Inhibits chemoreceptor of carotid body', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Inhibits chemoreceptor of carotid bodyActually both option c & d are incorrect as carotid body chemoreceptors are not found in respiratory tract. Carotid body and aoic odies are located in connective tissue associated with wall of common carotid aery and arch of aoa, respectively.But, option \'C\' can be considered correct as acetylcholine stimulates chemoreceptors (not inhibits)."Acetylcholine increases chemoreceptor discharge in carotid body". - Principles of medical physiologyThus best answer here is option \'d\'.About option a & b Acetylcholine causes bronchoconstriction and increases tracheobronchial secretions.', 'role': 'assistant'}]