You will be given a definition of a task first, then some input of the task.
In this task, you are given a context paragraph of the tweet and question. Your task is to generate right answer of given question based on given context tweet paragraph.

Context: A black day... @albertocontador abandons @letour after a crash on the descent #TDF Tinkoff Saxo (@tinkoff_saxo) July 14, 2014 Question: why did alberto contador abandon the letour?
Output:
a crash