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
Mast Cells 
Select and explain. 
A. Seldom found in pulp, B. Abundant in inflamed pulp, C. Have granular cytoplasm with round nuclei, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Mast cells:

Mast cells are seldom in large numbers in normal, healthy pulps, but are commonly found in inflamed pulp.
Have granular cytoplasm with round nucleus.