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
[{'content': 'In which part of the oral cavity has thinnest mucous membrane: \nSelect and explain. \nA. Buccal mucosa., B. Labial mucosa., C. Floor of the mouth., D. Soft palate.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]