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
Adequate vestibular depth is important for 
Select and explain. 
A. Good aesthetics, B. Good occlusion, C. Good oral hygiene, D. Muscular function
C: Good oral hygiene
Answer: C: Good oral hygiene 
Explanation: None