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
For accurate replica production of intra and extraoral tissues, impression materal should be transform into a rubbery or rigid solid in the mouth within? 
Select and explain. 
A. 2 minutes, B. 7 minutes, C. 10 minutes, D. 15 minutes
B: 7 minutes
Answer: B: 7 minutes 
Explanation: None