Question: According to Katy Perry, California Gurls is an answer song to what song by Jay-Z that featured vocals by Alicia Keys?
Context: La Coacha is a Mexican-American comedian, singer, blogger and internet personality.  She became Perez Hilton's protégé after 'stalking' him for a number of years.  Her videos are often featured on his website.  La Coacha's internet videos are popular, with her parody of Lady Gaga's Alejandro totaling over three million views.  Her parody of Katy Perry's "California Gurls" titled "Kardashian Gurls", was her first parody available for purchase on iTunes.  Perez Hilton raps in both the song and the video.  Kim Kardashian, Khloé Kardashian and Katy Perry all admitted to loving the video. "Empire State of Mind" is a song performed by American rapper Jay-Z and featuring vocals by American singer Alicia Keys that was written by Angela Hunte and Jane't Sewell-Ulepic.  Produced by Al Shux, Angela Hunte and Jane't Sewell-Ulepic, it was released as the third single from Jay-Z's 11th studio album, "The Blueprint 3" (2009), by his Roc Nation label in October 2009.  The song was written as a tribute to both artists' hometown, New York City, and features music samples of "Love on a Two-Way Street" performed by The Moments.  The following month they submitted the song to Jay-Z's Roc Nation, whose reviews were a discouragement.  Following an incident that Hunte and Sewell-Ulepic describe as an omen, they took the suggestion of an associate of EMI Music Publishing and resubmitted it to Jay-Z, who kept the "New York" singing part on the hook, changed the verses, and recorded it as a single. American singer Katy Perry has released five studio albums, one live album, two extended plays (EP), 27 singles (including three as featured artist), and five promotional singles. Perry has been certified for 90 million digital singles and 6 million albums in the United States as of August 2017.  She is also the third best selling digital singles artist in the US according to Recording Industry Association of America (RIAA).  As of November 2012, Perry has sold over 100 million records globally.  She currently holds the record for most 5-million-selling singles in the United States, with six of her singles selling over 5 million (in order of release date: "Hot n Cold", "California Gurls", "Firework", "E.T.", "Roar", and "Dark Horse").  Perry also holds the record for the most 6-million-selling songs, with three of her songs—"Firework", "Roar", and "Dark Horse"—selling over 6 million copies.  All three have also received Diamond song certifications from the RIAA, making her the first artist to accomplish such a feat. Beyoncé and Katy Perry were the only artists to achieve three number one songs in 2010; the former with "Why Don't You Love Me", "Telephone", a collaboration with Lady Gaga featuring Beyoncé, and "Video Phone", another collaboration between the two, but with Beyoncé featuring Lady Gaga.  Perry attainted three number one songs with "California Gurls", a collaboration with Snoop Dogg, "Teenage Dream", and the promotional single "Peacock".  Gaga and Rihanna were the only artists to top the chart four times each.  As well as "Bad Romance", "Telephone" and "Videophone", Gaga also reached number one with "Alejandro".  Rihanna topped the chart with "Russian Roulette", "Hard", a collaboration with Jeezy, "Rude Boy", and "Only Girl (In the World)".  Goldfrapp's "Rocket", which peaked at number one on May 1, ranked at number one on the 2010 Hot Dance Club Songs year end chart. The song with the most weeks in chart is Katy Perry's "California Gurls" with Snoop Dogg with 28 weeks.  Coming close in second was Taio Cruz's "Dynamite" with 26 weeks but even so none of them received the peak position.  The number one spot was achieved by New Zealand RnB sensation J.Williams featuring great rapper Scribe with the single "You Got Me".  This gave both singers a great achievements.  You Got Me being the first New Zealand annual number 1 single in 6 years since Ben Lummis's "They Can't Take That Away", and Scribe becoming the first artist ever to have 2 year end number 1 singles the other being "Stand Up/Not Many". "Geek and Gamer Girls", stylized G33K & G4M3R Girls, is a music video by the girl group Team Unicorn.  It pays tribute to women who love gaming, manga, and science fiction.  The video reached 1 million views in its first week online and stirred controversy over its sexy portrayal of the women. " Robot Chicken" creator Seth Green performs a rap in the video.  Actress Katee Sackhoff and comic book creator Stan Lee also appear.  The music video is noted for its abundance of cultural references.  parodying Katy Perry's "California Gurls". The fifteenth cycle of America's Next Top Model premiered on September 8, 2010 and was the ninth season to be aired on The CW network.  The promotional song for this cycle is "California Gurls" by Katy Perry.  The episode titles for this cycle were based on the guest judges. "California Gurls" is a song recorded by American singer Katy Perry.  It served as the lead single for her third studio album, "Teenage Dream" (2010).  The song features verses from rapper Snoop Dogg.  Both artists co-wrote the song with Bonnie McKee and its co-producers Dr. Luke and Max Martin, with additional production from Benny Blanco.  According to Perry, "California Gurls" is an answer song to "Empire State of Mind" (2009), by Jay-Z and Alicia Keys.  Its midtempo production incorporates disco-pop, and funk-pop with influences of new wave, and electropop.  Its lyrics are an ode to the state of California, in which both Perry and Snoop Dogg were born and raised. "Empire State of Mind (Part II) Broken Down" is a song performed by American recording artist Alicia Keys.  It is an answer song to the "Billboard" Hot 100 number-one hit "Empire State of Mind" by Jay-Z, on which Keys is featured.  It was only officially released in the United Kingdom as the second single from her 2009 album "The Element of Freedom" although it gained international airplay and download sales. Team Unicorn is a multimedia production team formed in Los Angeles, California in 2010.  Its current members are American actresses Clare Grant ("Walk the Line"), Rileah Vanderbilt ("Hatchet"), Milynn Sarley, and Alison Haislip ("Attack of the Show! ") who replaced Michele Boyd in 2014.  The group is known for producing parody song videos such as "G33k & G4m3r Girls", a spoof of Katy Perry's "California Gurls", and "All About that Base", a Star Wars parody of Meghan Trainor's song "All About That Bass".  The videos have established the group among nerd music as well as attracting celebrity appearances.  The group had a show on Adult Swim called "The Team Unicorn Saturday Action Fun Hour", and have attended numerous science fiction and comic conventions.
Answer: Empire State of Mind