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 are the most common type of receptors? \nSelect and explain. \nA. M2, B. M3, C. M1, D. M4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: M3 receptors are the most common cholinergic receptors present on eye, GI tract, bladder, blood vessels, bronchus, salivary, sweat and lacrimal glands Ref: KDT 7th e pg 101-102', 'role': 'assistant'}]