You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.

[Q]: Do you mean the cat's cradle?, where you can make intricate designs with a piece of string by making movements with your fingers?
[A]: how do you make a chain on your hands???? with string???

[Q]: "I disagree with what you say, but to the death I will defend your right to say it." -Voltaire
[A]: What is your favorite quotation by a famous author?

[Q]: Contrails are caused by water in the exhaust of jet engines and then freezing in the upper atmosphere. It's basically the same thing as a cirrus cloud. High performance airplanes can make white trails off their wingtips or on top of their wings which is caused by low pressure which in turn reduces the amount of water that is naturally in the air that the air can hold and it forms a cloud. An interesting side note is that long contrails = high relative humidity, short contrails = low realitve humidity.
[A]:
why sometimes a white foggy line or trail made behind the airplane in the sky.?