Chapter 18, Problem 12RA

Which of these statements about vitamin ${\text{B}}_{\text{12}}$ is false?

$\begin{array}{l}\text{a}\text{. Lack of this vitamin can produce pernicious anemia}\text{.}\hfill \\ \text{b}{\text{. Intrinsic factor is needed for absorption of vitamin B}}_{\text{12}}\text{.}\hfill \\ \text{c}{\text{. Damage to the gastric mucosa may lead to a deficiency in vitamin B}}_{\text{12}}.\hfill \\ \text{d}{\text{. Vitamin B}}_{\text{12}}\text{ is absorbed primarily in the jejunum}\text{.}\hfill \end{array}$