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.

Ex Input:
Question: The Statue of Liberty was built in France and then taken apart into 350 pieces for shipping. When the pieces arrived in New York, the statue was put together. Which statement describes the relationship between the mass of the 350 pieces and the mass of the whole statue? (A) The mass of the pieces is greater than the mass of the statue. (B) The mass of the pieces is the same as the mass of the statue. (C) The mass of the statue is greater than the mass of the pieces. (D) The mass of the statue is not related to the mass of the pieces.?

Ex Output:
350, pieces, mass, 350, pieces, mass, whole, statue?


Ex Input:
Question: A mother hen clucks loudly when danger is near and her chicks quickly gather around her. Which sense helps the chicks receive this warning about danger from their mother? (A) smell (B) taste (C) sight (D) sound?

Ex Output:
hen, clucks, chicks, sense, chicks, warning


Ex Input:
Question: Which of the following environments would be the BEST suited for an amphibian? (A) desert (B) arctic (C) tropical (D) savanna?

Ex Output:

environments, BEST, amphibian?