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
Which of the following is a zone observed in hard palate 
Select and explain. 
A. Fatty zone, B. Glandular zone, C. Gingival region, D. All of the following
D: All of the following
Answer: D: All of the following 
Explanation: The following zones can be observed in hard palate 

Gingival region, adjacent to the teeth.
Palatine raphae, also known as median area, extending from the incisive papillae or palatine papillae posteriorly.
Anterolateral area or fatty zone between the raphae and gingiva.
Pcsterolateral area or glandular zone between the raphae and gingiva.