Passage: Two of Yezi's performances were released as singles during the show: "Solo (Remix)" (featuring Jay Park and Loco) and "Listen Up" (featuring Hanhae). Both songs charted on the Gaon Digital Chart, at numbers 16 and 27, respectively. Yezi was not well known as a member of Fiestar, and had significantly more public recognition after Unpretty Rapstar. She stated: "Before the show, people were like 'I think I saw her somewhere', but now people recognize me immediately, even if I'm not wearing my performance clothes." Her fans appreciated her "fierce" rapping style and "bad girl" image.Yezi pre-released a new version of "Crazy Dog" on December 11, 2015. It was produced by Rhymer of Brand New Music and features San E, one of the judges on Unpretty Rapstar. Her debut maxi single, Foresight Dream, was released on January 28, 2016. It was produced by Rhymer and has four songs, including "Cider", which was promoted on various music shows. Another song, "Sse Sse Sse", features fellow contestants Gilme, KittiB and Ahn Soo-min.On 23 December 2015, Yezi released a promotional single titled "Z-Noid" for the game Counter-Strike Online and also filmed a music video.

Question: When did she pre-release Crazy Dog?
December 11, 2015