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
[{'content': '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: \nSelect and explain. \nA. Irreversible inelastic, B. Irreversible elastic, C. Reversible elastic, D. Reversible inelastic', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]