Question

T-cells become specialized in the

bone marrow.

spleen.

thymus.

lymph nodes.

Answer 1

the Thymus

T cells are generated in the Thymus and are programmed to be specific for one particular foreign particle (antigen). Once they leave the thymus, they circulate throughout the body until they recognise their antigen on the surface of antigen presenting cells (APCs)

Answer 2

Here is an article:

T cells (T lymphocytes) derive their names from the organs in which they develop in the thymus. I’m thinking
Thymus