This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Body Fluids, Subject name: Physiology
Major cation in intracellular space: 
Select and explain. 
A. Proteins, B. Potassium, C. Sodium, D. Chloride
B: Potassium
Answer: B: Potassium 
Explanation: Ans: B (Potassium) Ref: Guyton & Hall. The Body Fluid Compartments: Extracellular and Intracellular FI aids. In: Textbook of Medical Phvsiobgy. 12th ed. Philadelphia: SaundersElsevier: 2012. P288.Explanation: (See the following table)