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': 'All of the following are used for measurement of ECF volume except \nSelect and explain. \nA. Antipyrine, B. Inulin, C. Mannitol, D. Sodium Thiocyanate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Antipyrine is used for measurement of total body water.', 'role': 'assistant'}]