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 in endodontics by 
Select and explain. 
A. Nygaard otsby, B. Hoshino, C. Bakland, D. Barnum
A: Nygaard otsby
Answer: A: Nygaard otsby 
Explanation: Nygaard otsby introduced EDTA. Barnum introduced Rubber Dam. Hoshino advocated the use of triple antibiotic paste