This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Most accurate for measurement of ECF volume \nSelect and explain. \nA. Deuterium oxide, B. Cr-51 labeled RBC, C. Inulin, D. Albumin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ECF volume is measured using inulin which is a polysaccharide.(Ref: Textbook of physiology N Geetha 2nd edition page no.61)', 'role': 'assistant'}]