Question:  "what U need?"  is a single, recorded by which Chinese singer, for his debut extended play "Lose Control" , Zhang Yixing (born (1991--) 07, 1991 ), better known by his stage name, which is?
Sentence (from "Ciara discography"): American singer Ciara has released six studio albums, one extended play, one DVD, one promotional single, twenty-seven singles, including seven as a featured artist, and twenty-eight music videos, including seven as a featured artist.
Relevant evidence: No