A Patient Is Being Treated for the Effects of a Longstanding

Multiple Choice

A patient is being treated for the effects of a longstanding vitamin $\mathrm{B}_{12}$ deficiency. What aspect of the patients health history would most likely predispose her to this deficiency?

A) The patient has irregular menstrual periods.
B) The patient is a vegan.
C) The patient donated blood 60 days ago.
D) The patient frequently smokes marijuana.