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
Pain due to thermal change after trauma will occur during 
Select and explain. 
A. Periapical inflammation, B. Periapical necrosis, C. PDL injury, D. Root fracture
D: Root fracture
Answer: D: Root fracture 
Explanation: None