Pathology Respiration 2829d643 Cells most important in causation of asthma are? A Macrophages B Mast cells C Neutrophils D Lymphocytes High-Yield 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.