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
Insufficient closure of the flasks during packing of denture base resin can result in: 
Select and explain. 
A. Poor colour stability, B. Less polymerization shrinkage, C. Increase in vertical dimension, D. Decrease in vertical dimension
C: Increase in vertical dimension
Answer: C: Increase in vertical dimension 
Explanation: None