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.

Context: Yellowstone River closed to ALL recreation in response to ongoing fish kill: Montana FWP (@MontanaFWP) August 19, 2016 Answer: yellowstone river
what river was closed?

Context: Gutted at such a sad end to an era. We're all three of us idiots in our different ways but it's been an incredible ride together.— Richard Hammond (@RichardHammond) March 25, 2015 Answer: incredible.
how was the ride together?

Context: UPDATE: 25,000 people evacuated so far from East #Aleppo & 750 from #Foua #Kefraya by @SYRedCrescent & our team. Operation still ongoing. ICRC Syria (@ICRC_sy) December 20, 2016 Answer: 25,000

how many people have been evacuated from east aleppo?