This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Equilibrium potential of K+ 
Select and explain. 
A. -70mV, B. -90mV, C. +70mV, D. +90mV
B: -90mV
Answer: B: -90mV 
Explanation: Equilibrium potential of K+ is -90mV.(Ref: Textbook of physiology AK JAIN 4th edition page no.34)