This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Which of the following system is most sensitive to atropine \nSelect and explain. \nA. Respiratory mucosa, B. Hea, C. Pupil, D. Gastrointestinal motility', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: HL Sharma 3rd ed: Pg no:154 The endpoint for atropinization is dried pulmonary secretions. Tachycardia and mydriasis must not be used to limit or to stop subsequent doses of atropine', 'role': 'assistant'}]