The answer is the first one (a): Lymphoid stem cells.
Explanation for each option:
a. Lymphoid stem cells: Correct. Lymphoid stem cells are responsible for giving rise to lymphocytes, which include T cells and B cells. T cells are a type of lymphocyte that plays a crucial role in the immune response.
b. Myeloid stem cells: Incorrect. Myeloid stem cells give rise to other types of blood cells, such as red blood cells, platelets, and certain types of white blood cells (e.g., neutrophils, basophils, eosinophils, and monocytes), but not T cells.
c. Hematopoietic stem cells: Partially correct but not the best answer. Hematopoietic stem cells are the multipotent stem cells that give rise to all blood cells, including both myeloid and lymphoid lineages. However, they do not directly give rise to T cells; they first differentiate into lymphoid stem cells, which then give rise to T cells.
d. Erythropoietin: Incorrect. Erythropoietin is a hormone that stimulates the production of red blood cells from myeloid stem cells, not T cells.
In summary, lymphoid stem cells specifically give rise to T cells, making option (a) the correct choice.
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