Which of the following is a unit of immune system?

Lymphocytes

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Erythrocyte

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Chondrocytes

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Parasite

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Solution

The correct option is B Lymphocytes
Lymphocytes are one of several different types of white blood cells. Lymphocytes are of two types B cells and T cells. When a macrophage engulfs organisms, B cells (humoral immunity) release antibodies which cause the destruction of bacteria. The T cells (cell-mediated immunity) destroy the infectious organisms by killing the body cells that are affected. Hence lymphocytes is a unit of the immune system.
So, the correct answer is 'Lymphocytes'.

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