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: Mr. Burk's students test the ability of aluminum, plastic, and sand to conduct electricity. Which could be a reasonable entry in their scientific journals after testing the three materials? (A) Only aluminum conducts electricity. (B) Aluminum, plastic, and sand are good conductors. (C) Only plastic and sand conduct electricity. (D) Only sand conducts electricity.?

Output: ability, sand, conduct, electricity., reasonable, entry, scientific, journals


Input: Consider Input: Question: Michael Faraday showed how electric current in a wire produces (A) molecules (B) chemicals (C) a vibration (D) a magnetic field?

Output: electric, current, wire, produces


Input: Consider Input: Question: A ball is tossed up in the air and it comes back down. The ball comes back down because of (A) gravity (B) friction (C) erosion (D) magnetism?


Output: ball, tossed