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
MCARDLE's maximum allowable sweat rate for 4 hours is 
Select and explain. 
A. 3.5 ltr, B. 21 ltrs, C. 2.5ltrs, D. 4.5 ltrs
D: 4.5 ltrs
Answer: D: 4.5 ltrs 
Explanation: 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