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
In which part of the oral cavity has thinnest mucous membrane: 
Select and explain. 
A. Buccal mucosa., B. Labial mucosa., C. Floor of the mouth., D. Soft palate.
C: Floor of the mouth.
Answer: C: Floor of the mouth. 
Explanation: Histologically mucosa of the floor of mouth is non-keratinized, thinnest and loosely adherent to the underlying structures. Loose attachment to the underlying tissue provide free mobility to the tongue.