$T$-cells are lymphocytes which produce the cellular immunity. These are developed from
Thymus
Liver
Spleen
Endothelium of blood vessels
$T$- Lymphocytes originate from
What is the role of spleen in Human body?
Give differences: $T$-lymphocytes and $B$-lymphocytes
Assertion $(A)$ : Antigen can be easily recognized because it has antigenic determinants.
Reason $(R)$ : The recognition ability is innate.
Definitions / Explanation : Antingen & Lymphoid organs.