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: Surgery
[{'content': 'Ordinary burns are caused by: \nSelect and explain. \nA. Moist heat., B. Chemicals., C. Dry heat., D. All of the above.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]