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 Input:
Which tribe has the highest population in nigeria?

Ex Output:
Which combined tribe has the highest population in nigeria?


Ex Input:
When was i know why the cage bird sings written?

Ex Output:
When was the book I Know Why the Caged Bird Sings written?


Ex Input:
Who is the father of emma on friends?

Ex Output:

Which character is the father of emma on friends?