instruction:
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.
question:
Who authorized the construction of the boulder dam?
answer:
Who authorized team of engineers to review the construction of the boulder dam? 
 Congress


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:
When did witney carson start dancing with the stars?
answer:

When did Witney Carson start as a troupe dancer with Dancing With The Stars? 
 2013