This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
Cells most important in causation of asthma are? 
Select and explain. 
A. Macrophages, B. Mast cells, C. Neutrophils, D. Lymphocytes
B: Mast cells
Answer: B: Mast cells 
Explanation: Ans. is 'b' i.e., Mast cells * Asthma is type 1 hypersensitivity reaction and Mast cells are the most important cells in type I hypersensitivity.