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: What trait might a tiger inherit from its parents? (A) Choice of mate (B) Hunting skills (C) Personality traits (D) Fur color?

Output: trait, tiger, inherit


Input: Consider Input: Question: Energy from the sun is called (A) solar energy. (B) sound energy. (C) chemical energy. (D) mechanical energy.?

Output: Energy, sun, called


Input: Consider Input: Question: Plant and animal life cycles are alike because they both (A) begin as eggs. (B) require the same amount of time. (C) have beginning, growing, and mature stages. (D) resemble their parents from the beginning stages.?


Output: Plant, animal, life, cycles, alike