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
NERNST's potential of Na+ is 
Select and explain. 
A. 61, B. -60, C. 90, D. -80
A: 61
Answer: A: 61 
Explanation: Nernst potential
Na+- +60mv
K+- -90mv
Cl- - -70mv