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 stability of a mandibular complete denture will be 
enhanced when: 
Select and explain. 
A. The level of occlusal plane is above the dorsum of the tongue, B. The tongue rests on the occlusal surface, C. The lingual contour of the denture is concave, D. The posterior teeth on the denture have a broad buccolingual width
B: The tongue rests on the occlusal surface
Answer: B: The tongue rests on the occlusal surface 
Explanation: Ideally, the best stability occurs when the occlusal plane is parallel and anatomically oriented to the ridges. An occlusion plane that is too high, forces the tongue into a new position. This can disrupt the normal position of the floor of the mouth resulting in partial loss of the border seal.