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 cure a heat cure resin, a proper heating cycle is necessary: 
Select and explain. 
A. To prevent the porosity, B. To prevent warpage, C. To prevent volume expansion, D. All of the above
A: To prevent the porosity
Answer: A: To prevent the porosity 
Explanation: None