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: "In what year was the number one single from Rihanna that was featured on Now That's What I Call Music! 38 released?" whose answer is January 21, 2011.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Rihanna number one single featured on Now That's What I Call Music! 38
Useful Output:

Doc 1: A true product of the early 2010s, though, We Found Love remains Rihanna's most-downloaded single. The track boasts a total of 1.4 million
Doc 2: 1, LOVE THE WAY YOU LIE, EMINEM FT RIHANNA ; 2, WE FOUND LOVE, RIHANNA FT CALVIN HARRIS ; 3, THIS IS WHAT YOU CAME FOR, CALVIN HARRIS FT RIHANNA
Doc 3: "Lemon" by N.E.R.D. featuring Rihanna  Rihanna was featured on the comeback single by N.E.R.D., "Lemon," which served as the lead single from
Doc 4: Rihanna's "Loud" album (Def Jam/Universal) achieved its first week at No. 1 on the U.K.'s first sales charts of 2011, as Matt Cardle's "When We
Doc 5: The song is Rihanna's second Hot 100 top 10 from her latest album, Talk That Talk. She spent 10 weeks at No. 1 with first single “We Found Love.