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.

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

Example Input: What is the white part of your nail?
Example Output: What is the white, crescent part of your nail? 
 lunulae

Example Input: What was the former name of st petersburg russia?
Example Output:
What was the name of st petersburg russia changed to on  26 January 1924 ? 
 Leningrad