You will be given a definition of a task first, then some input of the task.
In this task, you will be given a passage, a question and a list of single-word events identified from the passage. The goal is to point out all events from the given event list that can answer the question. If a question is unanswerable or none of the events answer the question, output should be empty.

Passage: The previous government of Silvio Berlusconi, which sent the troops, had also planned to withdraw soldiers by the end of the year. Prodi said earlier this week he had informed U.S. President George W. Bush about the return of Italian troops. Question: What has happened before the return will be taking place? Events: ['sent', 'planned', 'withdraw', 'said', 'informed', 'return']
Output:
sent