问题
单项选择题
A client is admitted to the hospital with an exacerbation of his chronic gastritis. When assessing his nutritional status, the nurse should expect a deficiency in（）
A. vitamin A.
B. vitamin B6.
C. vitamin B12.
D. vitamin C.
答案
参考答案：C
解析：
Injury to the gastric mucosa causes gastric atrophy and impaired function of the parietal cells. This results in reduced production of intrinsic factor, which is necessary for the absorption of vitamin B12. Eventually, pernicious anemia will occur.