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
EDTA was introduced to endodontics by 
Select and explain. 
A. Nygaard Otsby, B. Ferdinand Munz, C. Ostbey Ingle, D. Rich chalter
A: Nygaard Otsby
Answer: A: Nygaard Otsby 
Explanation: None