You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who is the winner of 2015 royal rumble?" whose answer is Roman Reigns.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who won 2015 royal rumble
Useful Output:

Doc 1: This year that winner was Roman Reigns, much to the chagrin of the crowd live. The crowd turned on the match as soon as Daniel Bryan was
Doc 2: Roman Reigns eliminates both of the old men to thunderous boos, which audibly grow when he begins to mount that comeback. Rusev is the last man
Doc 3: WWE Royal Rumble 2015 results · | Royal Rumble 2015 exclusive interviews · Roman Reigns wins the 2015 Royal Rumble Match ( RESULTS | PHOTOS |
Doc 4: 2015: Roman Reigns. 2014: Batista. 2013: John Cena. Editor's Picks. Who has the most WWE world titles? What are longest reigns? 5dAlex Kennedy.
Doc 5: The Ascension wins in a lengthy squash. Normally 1-star, but I'll give it 1.5 because it was the first time WWE didn't screw up The Ascension.