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The correct option is D Basophil - Secretes serotonin inflammatory response
The given diagram shows a basophil cell which is a granulocyte i.e. a type of leucocytes or white blood cells (WBCs) which contain granules. Basophil cells have a S-shaped or twisted nucleus. These are least numerous WBCs in blood. They make 0.5- 2.7% of total leucocytes. These cells secrete histamine, serotonin and heparin. Thus, these cells also regulate allergic and inflammatory responses in body.
So, the correct answer is 'Basophil - Secretes serotonin inflammatory response'.