This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Delayed hypersensitivity is due to - 
Select and explain. 
A. Neutrophils, B. Monocytes, C. Eosinophils, D. Lymphocytes
D: Lymphocytes
Answer: D: Lymphocytes 
Explanation: Ans. is 'd' i.e., Lymphocytes Cell mediated (Type IV) hypersensitivityo It is initiated by activated T-lymphocytes.o It includes:1. Delayed type hypersensitivity - mediated by CD-4 T cells.2. T-cell mediated cytotoxicity - mediated by CD8- T cells.