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.

Who sang on the banks of the river?
Who sang background on the 1959 song with lyrics on the banks of the river?

What are the two types of mixtures in science?
What is the type of mixtures in science in which its constituents are distributed uniformly?

Who played helen lawson in valley of the dolls?

Who played Helen Lawson in Valley of the Dolls TV series?