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
To prevent porosity in self-cure acrylic resin, curing should be carried in: 
Select and explain. 
A. Cold water, B. Hot water, C. Under tap water, D. Under vacuum pressure
D: Under vacuum pressure
Answer: D: Under vacuum pressure 
Explanation: None