Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Sebastian Vettel laughed off Nico Rosberg’s claim that he hopes Ferrari can catch Mercedes during a spiky press conference after Sunday's Australian Grand Prix. Lewis Hamilton, who romped to victory at the season-opening race in Melbourne, and team-mate Rosberg, finished more than half-a-minute clear of Vettel to seal an utterly dominant weekend for the world champions. After the race, Rosberg said he hoped Ferrari would be able to bring the challenge to Mercedes, with he and Hamilton expected to dominate this term having won 16 of the 19 races in 2014. Lewis Hamilton was caught in the middle as Nico Rosberg (left) and Sebastian Vettel traded jibesSebastian Vettel issued spiky response when Nico Rosberg claimed he hoped Ferrari would be able to catch frontrunners MercedesVettel quizzed: 'You hope you slow down? Is that what you are saying?'The spat rumbled on throughout the post-race press conferenceRosberg and Vettel finished behind race winner Lewis Hamilton 
 Question:_ responded: ‘I hope that you can give us a challenge.

Nico Rosberg