(D) Cholecystokinin $(CCK)$ and duocrinin are gastrointestinal hormones.$CCK$ is secreted by the $I$-cells of the duodenal and jejunal mucosa.Duocrini

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(D) Cholecystokinin $(CCK)$ and duocrinin are gastrointestinal hormones.$CCK$ is secreted by the $I$-cells of the duodenal and jejunal mucosa.Duocrinin is secreted by the mucosa of the duodenum.Both of these hormones are produced by the endocrine cells located in the wall of the small intestine.Therefore,the correct option is $D$.