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: Which of the following BEST describes what happens when magnets repel each other? (A) the magnets create electricity (B) the magnets pull toward each other (C) the magnets push away from each other (D) nothing happens?

Output: magnets, repel


Input: Consider Input: Question: A student plans to design a new toothpaste tube that will give the same amount of toothpaste every time it is squeezed. Which should the student do first when designing the new tube? (A) make a data table of amounts of toothpaste (B) gather building materials (C) create models of old toothpaste tubes (D) draw a few possible solutions?

Output: toothpaste, tube, toothpaste, time, student, first, designing


Input: Consider Input: Question: Owen tested a physical property of a mineral. He rubbed a mineral sample on a piece of white tile. The mineral left a red mark on the tile. Which of the following physical properties of the mineral was Owen most likely testing? (A) cleavage (B) hardness (C) luster (D) streak?


Output: property, mineral., rubbed, mineral, sample, tile., red, mark, physical, properties, testing?