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
[{'content': 'True statement regarding extracellular fluid to intracellular fluid is: \nSelect and explain. \nA. ECF is rich in K+, B. ECF volume is twice that of the ICF, C. ECF is rich in organic anion, D. There is high sodium and low potassium in ECF', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Option A is incorrect. ICF is rich in K+; ECF has a low concentration of K+. Option B is incorrect. ICF volume (28 L) is twice the volume of ECF (14 L). Option C is incorrect. ICF is rich in organic anions, the proteins. Other anions in ICF are inorganic phosphate. Option D is correct. There is high sodium and low potassium in ECF.', 'role': 'assistant'}]