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
[{'content': 'Most abundant ion in intracellular fluid is:September 2008, September 2012, March 2013 \nSelect and explain. \nA. Protein, B. Bicarbonate, C. Potassium, D. Sodium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: PotassiumIntracellular component of the body water accounts for about 40% of body weight and extracellular component for about 20%.Concentration of potassium in cytosol is 139 millimeter and of Amino acids (in proteins) is 138 millimeter,', 'role': 'assistant'}]