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
Which of the following is an ionotropic receptor? 
Select and explain. 
A. Muscarinic cholinergic receptor, B. Nicotinic cholinergic receptor, C. Glucocoicoid receptor, D. Insulin receptor
B: Nicotinic cholinergic receptor
Answer: B: Nicotinic cholinergic receptor 
Explanation: Nicotinic cholinergic receptor- Ionotropic receptor Muscarinic cholinergic receptor- G-protein coupled receptor Glucocoicoid receptor- Intracellular receptor Insulin receptor- Enzymatic receptor