TASK DEFINITION: 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.
PROBLEM: What led to the end of indus valley civilization?

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

PROBLEM: When does the under 20s rugby world cup start?

SOLUTION: When does the 2017 under 20s rugby world cup start? 
 31 May 2017

PROBLEM: When did the first settlers come to america?

SOLUTION:
When did the first settlers come to america through Alaska? 
 shortly after 20,000 years ago