This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Optimal operation theatre temperature should be \nSelect and explain. \nA. 21degC, B. 28degC, C. 32degC, D. 37degC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Optimal operation theatre temperature for adults is 21degC and for children is 28degC.', 'role': 'assistant'}]