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': 'Mast Cells \nSelect and explain. \nA. Seldom found in pulp, B. Abundant in inflamed pulp, C. Have granular cytoplasm with round nuclei, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mast cells:\n\nMast cells are seldom in large numbers in normal, healthy pulps, but are commonly found in inflamed pulp.\nHave granular cytoplasm with round nucleus.', 'role': 'assistant'}]