In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to provide one question which clarifies the input question and it has one unique answer, and also provide an answer to the generated question. Generated question and answer should be separated with a new line.

Who was the actress that played rizzo in grease?
Who played rizzo in the 1978 film grease? 
 Stockard Channing

Where does south africa's water come from?
What rivers does south africa's water come from? 
 Olifants River

Who has the fastest 40 yard dash in the nfl combine?

Who has the fastest official 40 yard dash at the NFL Combine since electronic timing was implemented? 
 John Ross