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: Pharmacology
Which of the following is an ionic channel ? 
Select and explain. 
A. a -1 receptors, B. b - 1 receptors, C. Nicotinic cholinergic receptors, D. Muscarinic cholinergic receptors
C: Nicotinic cholinergic receptors
Answer: C: Nicotinic cholinergic receptors 
Explanation: Ans. is 'c' i.e., Nicotinic cholinergic receptors