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: None