This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
[{'content': 'Sodium channel is \nSelect and explain. \nA. Trimeric, B. Pentameric, C. Heterotrimeric, D. Pseudoterameic', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) HeterotrimericNa K pump has 2 subunits and both the subunits are different. That's why it is called as a heterodimerIt can contain one alpha, one beta and one gamma subunit also - so, heterotrimeric", 'role': 'assistant'}]