(D) The endocrine part of the pancreas is known as the islets of Langerhans.It contains $4$ types of cells: $\alpha$-cells (alpha cells),$\beta$-cells

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(D) The endocrine part of the pancreas is known as the islets of Langerhans.It contains $4$ types of cells: $\alpha$-cells (alpha cells),$\beta$-cells (beta cells),$\delta$-cells (delta cells),and $PP$-cells (or $F$-cells).Therefore,the correct answer is $4$.