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
[{'content': 'Which of the following strata of oral epithelium is engaged in mitosis? \nSelect and explain. \nA. Basale., B. Granulosum., C. Corneum., D. Spinosum.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The site of cell division (mitosis) occurs in the stratum basale (basal layer, stratum germinativum) of oral epithelium.', 'role': 'assistant'}]