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.

[EX Q]: Question: Which likely increased atmospheric CO2 recently? Answer: motorcycles.
[EX A]: carbon dioxide concentrations in the air have increased over the last decade dramatically

[EX Q]: Question: Which is most harmful to a human? Answer: dynamite going off.
[EX A]: explosions can cause harm to an organism

[EX Q]: Question: In order to assemble a bike, the following are needed with exception of? Answer: Nails.
[EX A]:
a bicycle contains screws