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': 'Out of the four layers, which cells of are the most active for protein synthesis: \nSelect and explain. \nA. Spinous cell., B. Basal cell., C. Granular cell., D. Corneum cell.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The spinous (prickle) cells resemble a cocklebur or sticker that has each spine ending at a desmosome. Of the four layers, the spinous cells are the most active in protein synthesis. These cells synthesize additional proteins that differ from those made in the basal cells.', 'role': 'assistant'}]