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
Dimensional stability of hydrocolloid impressions may be achieved by: 
Select and explain. 
A. Using less water powder ratio, B. Storing the impression under water, C. Prolonged manipulation, D. Using humidor
D: Using humidor
Answer: D: Using humidor 
Explanation: None