Instructions: 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.
Input: Context: The Great Barrier Reef of Australia passed away in 2016 after a long illness. It was 25 million years old: #RIP Outside Magazine (@outsidemagazine) October 12, 2016 Answer: 2016.
Output:
when did the great barrier reef pass?