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
"Two in one stage" impression materials include 
Select and explain. 
A. Zinc-Oxide eugenol impression paste, B. Hydrocolloid impression material, C. Elastomeric impression material, D. All of the above
C: Elastomeric impression material
Answer: C: Elastomeric impression material 
Explanation: None