Naive T cells travel from the bone marrow to a specific organ for maturation, where T cells reactive to self-antigens are destroyed. Which organ is this?

1. Immune cells originate from hematopoietic stem cells in the bone marrow. 2. B cell maturation occurs in the bone marrow, while naive T cells transit to the thymus for maturation. 3. In the thymus, immature T cells that react against self-antigens are destroyed, helping prevent autoimmune responses. 4. The spleen filters blood, the liver makes complement proteins, and the pancreas is unrelated to T cell maturation, so none of them is the organ described here. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 42 "The Immune System", section Primary Centers of the Immune System_