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: Surgery
[{'content': 'A 32-yrs-old man visits you for a periodic health examination. He has no complaints at this time. He is 170 cm (5 ft 7 in) tall and weights 75 kg. In this patient, the volumes of total body water, intracellular fluid, and extracellular fluid are, respectively. \nSelect and explain. \nA. 40L, 30L, 10L, B. 45L, 30L, 15L, C. 45L, 35L, 10L, D. 50L, 25L, 25L', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Total body water (TBW) in liters equals approximately 60% of body weight in kilograms and therefore equals 45 L in a 75-kg person. Intracellular volume = 2/3 of TBW and is therefore 30 L in this case. Extracellular volume = 1/3 of TBW and is therefore 15 L in this case.', 'role': 'assistant'}]