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B
Heparin and calcitonin
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C
Serotonin and melanin
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D
Vasopressin and relaxin
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Solution
The correct option is A Heparin and histamine A mast cell contains many granules rich in histamine and heparin. Mast cells are located in connective tissue, including the lung, skin, the linings of the stomach and intestine, and other sites.