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
Pulpless primary incisor (abscess caused by trauma) in 4
year old patient can be effectively treated by 
Select and explain. 
A. Pulpectomy, B. Extraction, C. 5-minute formocresol pulpotomy, D. 7-day formocresol pulpotomy
A: Pulpectomy
Answer: A: Pulpectomy 
Explanation: None