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: Social & Preventive Medicine
[{'content': "An hour sweat rate should be MCARDLE's maximum allowable sweat rate – \nSelect and explain. \nA. 3.5 litres, B. 21 litres, C. 2.5 litres, D. 4.5 litres", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]