Definition: In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
Input: Question: African Americans have darker skin than other Americans. Researchers were not surprised to discover therefore, that vitamin D insufficiency among African Americans is _____ than among other Americans?
Answer: more prevalent
Output:
Pigments in the skin act like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun than people with lighter skin to make the same amount of vitamin D.