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
Porosity present in a acrylic denture is usually the result of: 
Select and explain. 
A. A prolonged curing cycle, B. Lack of sufficient pressure applied to flask, C. Insufficient acrylic resin monomer, D. Prolonged bench cooling after curing
B: Lack of sufficient pressure applied to flask
Answer: B: Lack of sufficient pressure applied to flask 
Explanation: None