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: Microbiology
The most important cells in type I hypersensitivity - 
Select and explain. 
A. Macrophages, B. Mast cells, C. Neutrophils, D. Lymphocytes
B: Mast cells
Answer: B: Mast cells 
Explanation: None