This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacodynamics, Subject name: Pharmacology
[{'content': 'Which of the following is an ionotropic receptor? \nSelect and explain. \nA. Muscarinic cholinergic receptor, B. Nicotinic cholinergic receptor, C. Glucocoicoid receptor, D. Insulin receptor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nicotinic cholinergic receptor- Ionotropic receptor Muscarinic cholinergic receptor- G-protein coupled receptor Glucocoicoid receptor- Intracellular receptor Insulin receptor- Enzymatic receptor', 'role': 'assistant'}]