In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Input: Consider Input: Sentence: Ion drives have low thrust but high efficiency. Question: Ion drives have low thrust but high what?

Output: efficiency


Input: Consider Input: Sentence: Co2 gas is released into the atmosphere when fossil fuels are burned. Question: What gas is released into the atmosphere when fossil fuels are burned?

Output: co2


Input: Consider Input: Sentence: Remains unchanged happens to the mass number during a nuclear decay process by positron emission. Question: What happens to the mass number during a nuclear decay process by positron emission?


Output: remains unchanged