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: Dental
[{'content': 'Pain due to thermal change after trauma will occur during \nSelect and explain. \nA. Periapical inflammation, B. Periapical necrosis, C. PDL injury, D. Root fracture', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]