This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Body fluid compaments, Subject name: Physiology
Major ions in ECF are: 
Select and explain. 
A. Sodium and phosphate, B. Potassium and chloride, C. Sodium and chloride, D. Potassium and phosphate
C: Sodium and chloride
Answer: C: Sodium and chloride 
Explanation: None