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]: What is a black spider with yellow stripes?
[EX A]: What is the common name for a black spider with yellow stripes?

[EX Q]: The office season 8 episode 7 guest stars?
[EX A]: The office season 8 episode 7 guest star's character?

[EX Q]: When did they start using rebar in concrete?
[EX A]:
When did they start using rebar in masonry?