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
8 year old child had fractured his maxillary central incisor 10 months ago. The pulp shows no response. There is no periapical lesion in the radiograph. The treatment of choice is 
Select and explain. 
A. Ca(OH)2 Pulp capping, B. Formocresol pulpotomy, C. Conventional root canal treatment, D. Complete debridement and apexification
D: Complete debridement and apexification
Answer: D: Complete debridement and apexification 
Explanation: None