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
Definitive treatment for the condition shown in radiograph below is? 
Select and explain. 
A. Apexogenesis, B. Revascularisation, C. Calcium Hydroxide apexification, D. MTA barrier formation
D: MTA barrier formation
Answer: D: MTA barrier formation 
Explanation: None