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: Anatomy
Which of the following strata of oral epithelium is engaged in mitosis? 
Select and explain. 
A. Basale., B. Granulosum., C. Corneum., D. Spinosum.
A: Basale.
Answer: A: Basale. 
Explanation: The site of cell division (mitosis) occurs in the stratum basale (basal layer, stratum germinativum) of oral epithelium.