A) fibroblasts
B) histocytes
C) lymphocytes
D) mast cells
Correct Answer: D
Solution :
Histamine is a potent vasodilator formed by decarboxylation of the amino acid histidine and released by mast cells in response to appropriate antigens. Mast cells which secrete histamine are especially prevalent in the connective tissue of the skin and respiratory tract and in surrounding blood vessels.
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