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': 'Acanthosis involves – \nSelect and explain. \nA. Str spinosum, B. Str granuolosum, C. Str Basale, D. Str corneum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Acanthosis\n\nThis term is used to describe an increase in a number of cells in the spinous cell layer or prickle cell layer of the epidermis.', 'role': 'assistant'}]