Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: Norman Mayers of Prefix Magazine wrote that B'Day is packed with standouts such as "the Rich Harrison-produced 'Freakum Dress' and the Neptunes-helmed 'Kitty Kat'." Link Information: "Irreplaceable" was ranked atop the US Billboard Year-End Hot 100 singles of 2007, and was the tenth best-selling digital single worldwide of 2007, having sold over four million copies worldwide by the end of 2007. It was the twenty-fifth most successful song of the 2000s (decade), according to the Billboard Hot 100 Songs of the Decade. Question: What track was most successful of the album that included Kitty Kat?
Student:
Answer: Irreplaceable