In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.

[EX Q]: Raised line markers on the roadway and shoulder are used to define?
[EX A]: Raised line markers on the roadway and shoulder are, parallel to drive directed are used to define?

[EX Q]: Who sings backup on thank you led zeppelin?
[EX A]: Who sings backup on Thank You by Led Zeppelin and plays drums for the band?

[EX Q]: When did the philadelphia eagles enter the nfl?
[EX A]:
When did the Philadelphia Eagles originally enter the NFL?