A) eosinophils
B) basophiles
C) monocytes
D) lymphocytes
Correct Answer: D
Solution :
Lymphocytes are four kinds of agranulocytes of leucocytes of blood. These are the main cells of immune system these are formed by thymus and liver in foetus and by bone marrow and lymph node in adult. After originations they circulate in stream of blood for 1-2 days, migrating to connective tissue, and then form macrophage. These are of two types, i.e., p-lymphocytes and T-lymphocytes. About 75% of circulating lymphocytes are T-lymphocytes.
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