Given the task definition and input, reply with output. In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

The basic roll-with-a-hole design is hundreds of years old and has other practical advantages besides providing for a more even cooking and baking of the dough: The hole could be used to thread string or dowels through groups of bagels, allowing for easier handling and transportation and more appealing seller displays.
why do bagels have holes in the middle