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
Which of the following best describes the working time of impression material? 
Select and explain. 
A. After the start of appearing elastic properties of impression material, B. Just after the start of appearing elastic properties of impression material, C. The time from start of mixing till just before the start of appearing elastic properties of impression material, D. Loss of lusture of impression material
C: The time from start of mixing till just before the start of appearing elastic properties of impression material
Answer: C: The time from start of mixing till just before the start of appearing elastic properties of impression material 
Explanation: None