This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Helper cells belong to - \nSelect and explain. \nA. T cells, B. Macrophages, C. B cells, D. Monocytes', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i..e.,T cells T-cells . T cells are amongst the two impoant cells of adaptive immune system (others are B-cells). . T cell precursors arise in bone marrow (also in yolk sac & liver before bih) 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).", 'role': 'assistant'}]