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.

Q: Context: #IWishMyTeacherKnew how to do a backflip. Ss challenging me to learn new things. It's exciting! #ChallengeAccepted Cassie Norsworthy (@mrsnorsworthy) April 17, 2015 Answer: how to do a back flip.

A: what type of challenge was accepted?
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Q: Context: One of the uncomfortable things I learned on my trip down the #endangeredriver. Irrigation caused this in the 1980s. John D. Sutter (@jdsutter) July 22, 2014 Answer: irrigation issues of the endangered river

A: what disaster happened in the 1980s?
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Q: Context: Shocked & upset 2 hear about #tompetty 'we got lucky when we found u….’…RIP Billy Idol (@BillyIdol) October 2, 2017 Answer: tom petty

A:
who just passed away in the tweet?
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