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
McCall's festoons are 
Select and explain. 
A. Also called Stittman's Clefts, B. Due to poor oral hygiene, C. Congenital abnormality, D. Due to trauma from occlusion
D: Due to trauma from occlusion
Answer: D: Due to trauma from occlusion 
Explanation: None