In this task, you are given a context tweet and an answer. Your job is to generate a question for the given answer based on the given tweet paragraph. Note that your question should be answerable based on the given tweet, and the answer to your question should be the given answer.

[EX Q]: Context: i will say this only once:taylor swift is not in the slytherin house, she just has slytherin friends— yung sweet lassi (@andnowtothemoon) August 21, 2017 Answer: there are four
[EX A]: how many houses are there in harry potter?

[EX Q]: Context: For #NationalSandwichDay, here's where I find some of my favorite fixes via @Pinterest: Alton Brown (@altonbrown) November 3, 2015 Answer: national sandwich day
[EX A]: what special day was referred to?

[EX Q]: Context: @spacegovuk @esa @Space_Station a brief viewing tonight. My daughter waving at the ISS shouting "Santa" Merry Christmas to the ISS crew.— David Downie (@dgdownie) December 24, 2015 Answer: david downie's daughter
[EX A]:
who waved at the iss?