In 35 characters or less, identify the theme of this question. This is a helpful tool when exam developers are searching for or selecting questions; they can have a quick glimpse without having to look at the entire question.
This is essential. Include print references (page numbers are required), websites (URLs are required), etc. The greater the authority the better: USDA trumps CDR, for example, but both would be acceptable. 2-3 references are preferred. Wikipedia is NOT an acceptable reference.