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
Vertical compaction of warm gutta-percha technique was given by: 
Select and explain. 
A. Grossman, B. Ingle, C. Schilder, D. Cohen
C: Schilder
Answer: C: Schilder 
Explanation: Vertical compaction of warm gutta-percha method of filling the root canal was introduced by Schilder with an objective of filling all the portals of exit with maximum amount of gutta-percha and minimum amount of sealer. This is also known as Schilder’s technique of obturation.