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
The advantage of metal base denture is: 
Select and explain. 
A. Increase in tissue tolerance, B. Easy laboratory procedure, C. Rebasing and relining are quite easy, D. Increase in restorative cost
A: Increase in tissue tolerance
Answer: A: Increase in tissue tolerance 
Explanation: None