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
Which of the following is absent in normal pulp 
Select and explain. 
A. Mast cells, B. Antigen presenting cells, C. T lymphocytes, D. Macrophages
A: Mast cells
Answer: A: Mast cells 
Explanation: None