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
The change in colour of a traumatized primary incisor
usually results from all the following except. 
Select and explain. 
A. Laceration of periodontal fibres, B. Diffusion of biliverdin into the dentinal tubules, C. Development of a heavy layer of secondary dentin, D. Internal resorption of dentin within the crown
A: Laceration of periodontal fibres
Answer: A: Laceration of periodontal fibres 
Explanation: None