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
A 65 year old  female wants a complete denture made. Intraoral examination reveals edentulous arches with  good ridge height and no signs of inflammation or xerostomia. Doctor made primary impression with impression compound. The material used is: 
Select and explain. 
A. Irreversible inelastic, B. Irreversible elastic, C. Reversible elastic, D. Reversible inelastic
D: Reversible inelastic
Answer: D: Reversible inelastic 
Explanation: None