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: Surgery
The contribution of operation of sodium potassium electrogenic pump for the development of net -90 millivolt on resting membrane potential is 
Select and explain. 
A. -4 millivolt, B. -80 millivolt, C. -70 millivolt, D. +4 millivolt
A: -4 millivolt
Answer: A: -4 millivolt 
Explanation: None