Chapter 18, Problem 1RA

Which of these statements about intrinsic factor is true?

$\begin{array}{l}\hfill \\ \text{a}\text{. It is secreted by the stomach}\text{.}\hfill \\ \text{b}\text{. It is a polypeptide}\text{.}\hfill \\ \text{c}{\text{. It promotes absorption of vitamin B}}_{\text{12}}\text{ in the intestine}\text{.}\hfill \\ \text{d}\text{. It helps prevent pernicious anemia}\text{.}\hfill \\ \text{e}\text{. All of these are true}\text{.}\hfill \end{array}$