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: Vessels are en route to assist a ship beset by ice 100nm east of French base Dumont D'Urville. AMSA News (@AMSA_News) December 25, 2013 Answer: it was beset by ice.
Output:
why are vessels on route to assist the ship?