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.

Example Input: Question: A town encourages its citizens to recycle glass and aluminum. What is the most reasonable explanation for this? (A) Recycled glass and aluminum have better properties than original glass and aluminum. (B) Recycled glass and aluminum can be used in cars instead of gasoline. (C) Recycling glass and aluminum can result in fewer resources being taken from the Earth. (D) Reusing glass and aluminum creates more energy for the town.?
Example Output: recycle, glass, aluminum., explanation

Example Input: Question: Which object is made to reflect light? (A) telescope (B) window (C) mirror (D) eyeglasses?
Example Output: reflect, light?

Example Input: Question: A female dog is having puppies. She has black fur, brown eyes, and a curly tail. She can sit, bark, and roll over on command. Which set of traits can the female dog's puppies inherit? (A) brown eyes, black fur (B) fur, roll over on command (C) brown eyes, sit on command (D) bark on command, curly tail?
Example Output:
black, brown, curly, tail., roll, traits, can, puppies, inherit?