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
Type I gypsum product is also called 
Select and explain. 
A. Impression plaster, B. Class I stone / Hydrocal, C. Class II stone/Densite, D. Model plaster
A: Impression plaster
Answer: A: Impression plaster 
Explanation: None