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.

[Q]: Sentence: There are four classes of biochemical compounds. Question: How many classes of biochemical compounds are there?
[A]: four


[Q]: Sentence: Electrostatic repulsions normally prevent a positively charged particle from colliding and reacting with a positively charged nucleus, but may be overcome by kinetic energy. Question: What normally prevent a positively charged particle from colliding and reacting with a positively charged nucleus, but may be overcome by kinetic energy?
[A]: electrostatic repulsions


[Q]: Sentence: The mars rover is the wheeled robot developed by nasa to explore the surface of mars. Question: What is the wheeled robot developed by nasa to explore the surface of mars?
[A]:
mars rover