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: Physiology
[{'content': 'Na+ &/or IC+ is/are involved in mechanism of action of which of the following receptor (s): \nSelect and explain. \nA. 5-HT3 receptor, B. Nm receptor, C. Nn receptor, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A,B,C All', 'role': 'assistant'}]