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
Which is concerned with cell mediated immunity? 
Select and explain. 
A. B - Lymphocytes, B. T - Lymphocytes, C. Eosinophils, D. Monocytes
B: T - Lymphocytes
Answer: B: T - Lymphocytes 
Explanation: Ans. is 'b' i.e., T - Lymphocytes (Ref: Ananthanarayan, 9th/e, p. 152)* Cellular (Cell mediated immunity) - T lymphocytes - defense against intracellular microbes.* Humoral immunity - B lymphocytes produces antibodies and convert into plasma cell which are responsible of immunogenic memory defense against extracellular microbes and their toxins.