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.

Input: Consider Input: Question: Sandra puts some pill bugs into an open box. She covers half the box with a piece of cardboard. She then places the box outside on a summer day, and all the pill bugs move under the cardboard. The pill bugs are most likely responding to which of the following? (A) air pressure (B) bright light (C) wind (D) fog?

Output: open, box., outside, summer, bugs, cardboard., pill, bugs, responding


Input: Consider Input: Question: An escalator at a shopping mall is 10 m long and moves at a constant speed of 0.5 m/s. If Josà¤¥à¤Š steps onto the escalator at the bottom while it is moving, how long will it take him to travel the 10 m? (A) 5 s (B) 10 s (C) 15 s (D) 20 s?

Output: escalator, 10, m, long, moves, constant, speed, 0.5, m/s., escalator, long, will, travel, 10, m?


Input: Consider Input: Question: In Florida, both panthers and bobcats prey on white-tailed deer. How will their competition for food most likely be affected if white-tailed deer populations in Florida suddenly decreases? (A) Competition will increase between bobcats and panthers. (B) Competition will decrease between bobcats and panthers. (C) Competition will increase between white-tailed deer and bobcats. (D) Competition will decrease between white-tailed deer and panthers.?


Output: panthers, bobcats, prey, deer., competition, food, affected, deer, populations, decreases?