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
Immediately following a traumatic injury to upper central incisor, pulp testing is negative. Treatment of choice would be: 
Select and explain. 
A. Pulpectomy, B. Pulpotomy, C. Apexification, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: A negative response, however, is not reliable evidence of pulp death because some teeth that give such a response soon after the injury may recover vitality after a time.