This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': "MCARDLE's maximum allowable sweat rate for 4 hours is \nSelect and explain. \nA. 3.5 ltr, B. 21 ltrs, C. 2.5ltrs, D. 4.5 ltrs", 'role': 'user'}, {'content': "Answer: D \nExplanation: Mc Ardle's maximum allowable sweat rate:4.5 litre/ 4 hours. Predicted 4 hr sweat rate (P4SR) in comfo zone is 1-3 L Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 792", 'role': 'assistant'}]