This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cells and Tissues of Immune System, Subject name: Pathology
[{'content': 'T - cells mature in? \nSelect and explain. \nA. Bone marrow, B. Liver, C. Thymus, D. Lymph nodes', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans is 'c' i.e., Thymus o T cell precursors arise in bone marrow (also in yolk sac & liver before birth) and migrate to the thymus. Maturity of T-cells takes place in the thymus (So, T cells arise in bone marrow and mature in thymus).o B cells originate as well as mature in bone marrow.", 'role': 'assistant'}]