In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[Q]: Question: What is most likely to occur before a rainstorm? Answer: atmospheric water droplets collide.
[A]: precipitation is when water falls from the sky


[Q]: Question: What is a source of oxygen through photosynthesis? Answer: sunflowers.
[A]: plants are a source of oxygen through photosynthesis


[Q]: Question: A herd of cattle is slowly making its way through a large field. The shepherd realizes that he forgot to bring grain for the cattle, yet the cattle will survive just fine in the field, because? Answer: they eat roughage.
[A]:
cows only eat plants