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': 'The following is true about body water \nSelect and explain. \nA. Water constitutes 60% of body weight, B. Plasma volume constitutes 10% of the body water, C. ECF volume can be determined by dilution methods, D. 10% is intracellular water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]