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B
B-cells
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C
NK cells
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D
Tumour cells
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Solution
The correct option is A Phagocytes
Macrophages are tissue resident professional phagocytes and antigen presenting cells (APC).
They differentiate from circulating blood monocytes. They perform an important active and regulatory function in innate as well as adaptive immunity.
Macrophage engulfs and digests cellular debris, foreign substances, microbes, cancer cells, and anything else that does not have the type of proteins specific to healthy body cells on its surface in a process called phagocytosis. The cells which have the ability to perform phagocytosis are called as phagocytes. Hence Macrophages are also known as Phagocytes