instruction:
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.
question:
Question: How does a human body get energy? (A) Sunlight on the skin produces energy. (B) Water provides the majority of energy. (C) Food and oxygen combine to deliver energy. (D) Sleep provides energy stored at night for the next day.?
answer:
human, body, get, energy?


question:
Question: Of these research projects, which is the best choice for a student who is interested in environmental issues to study? (A) making cars run on less fuel (B) finding more sites for copper mines (C) making ocean liners bigger and faster (D) replacing human workers with robots?
answer:
choice, student, interested, environmental, issues


question:
Question: How can students test if aluminum, wood, and plastic can conduct electricity? (A) Testing which material floats in a cup of water (B) Weigh on a pan balance (C) Using the materials in a complete circuit (D) Making a picture of each material?
answer:

test, plastic, conduct, electricity?