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.
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Question: What led to the end of indus valley civilization?

Answer: According to Sir Mortimer Wheeler in 1953, what led to the end of indus valley civilization? 
 "Aryan invasion"


Question: Who plays dorthy in the wizard of oz?

Answer: Who played Dorothy in the 1939 film, The Wizard of Oz? 
 Judy Garland


Question: Who has the most career nba triple doubles?

Answer:
Who has the most career NBA triple-doubles in regular season? 
 Oscar Robertson