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 occlusion in an obturator appliance of elderly patient should be? 
Select and explain. 
A. Balanced towards the kesion, B. Margin to fossa, C. Monoplane, D. Cusp to cusp
C: Monoplane
Answer: C: Monoplane 
Explanation: None