This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
[{'content': 'In an adult man weighing 70 Kgs, the Total body water volume will be about - \nSelect and explain. \nA. 42L, B. 25L, C. 15L, D. 12L', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. 42L60% of body weight is composed of water. Therefore, total body water in a 70 Kg man would be 60% of 70 Kg, ie, 42 Kg, which is equivalent to 42 L.', 'role': 'assistant'}]