You are given an elementary science question along with a few answer options. List all the words from the question that are essential and sufficient for choosing the correct answer option. Keep in mind that essential words are necessary to understand the meaning of the given question. However, non-essential words provide little information needed to select the correct answer. You can think about it like this: If the question was in another language, knowing the meaning of which words were necessary and enough for you to understand the question and answer it?. If your answer consists of multiple spans of words from the question, separate those using a comma (", "). Do not generate any word that is not present in the question. Make sure that your response is contained in the given question and the words are in the same order as the question.
 Grammatical correctness is not important.

Ex Input:
Question: A drop of red food coloring is added to a bowl of water. Several minutes later, all of the water is red. Which of these describes the change that took place? (A) erosion (B) osmosis (C) diffusion (D) transfusion?

Ex Output:
drop, red, food, coloring, added, water., water, red., describes, change


Ex Input:
Question: As Archie walks to the park, he wonders which route would be faster. He decides to walk to the park using different routes and times how long it takes. Which should he do to make his comparison fair? (A) walk to different parts of the park each day (B) walk with a different friend each day (C) walk at the same speed each day (D) walk at the same time of the day?

Ex Output:
route, faster., different, routes, times, make, comparison, fair?


Ex Input:
Question: Which inventor had the greatest impact on the development of artificial light? (A) Charles Darwin (B) Albert Einstein (C) Thomas Edison (D) Benjamin Franklin?

Ex Output:

inventor, impact, development, artificial, light?