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: Physiology
[{'content': 'A man working under conditions of high temperature should increase his intake of \nSelect and explain. \nA. NaCl, B. Iron, C. Vitamin D, D. Phosphates', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]