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.
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Question: Question: Which of these would most likely improve the air quality in large Texas cities?

Answer: improve, air, quality, Texas, cities?


Question: Question: Sally is making candy on the stove. She places a thermometer in the candy. What is she measuring? (A) length (B) speed (C) temperature (D) weight?

Answer: thermometer, measuring?


Question: Question: In a container, a mixture of water and salt is stirred so that the salt dissolves completely. Sand is added to this solution and allowed to settle to the bottom of the container. If the container is placed on a heat source and the liquid evaporates completely, what will be left in the container? (A) Nothing will remain in the container. (B) Only salt will remain in the container. (C) Only sand will remain in the container. (D) Salt and sand will both remain in the container.?

Answer:
water, salt, dissolves, Sand, added, settle, container, heat, source, liquid, evaporates, left