问题
单项选择题
Which of the following nutritional deficiencies may delay wound healing（）
A. Lack of thiamine.
B. Lack of vitamin C.
C. Lack of folate.
D. Lack of vitamin A.
答案
参考答案：B
解析：
Vitamins C, B6, and B12 are necessary for collagen synthesis that takes place during wound healing. Folate enables oxygen transport. Vitamin A is needed for reversal of effects of the glucocorticoids. Thiamine is required for carbohydrate metabolism.