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
Sodium channel is 
Select and explain. 
A. Trimeric, B. Pentameric, C. Heterotrimeric, D. Pseudoterameic
C: Heterotrimeric
Answer: C: Heterotrimeric 
Explanation: 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