<prompt> T cells are derived from:TonsilsThymusThalamusThyroid  <response>: Ans. B ThymusRef: BDC, 6th ed. vol. II pg. 147T cells originate in the bone marrow but mature in the thymus. So, T stands for Thymus. Thymus and bone marrow are primary lymphoid organs. Lymph node and spleen are secondary lymphoid organs. 