Xiao Wang, Xiao Zhang, Xiao Li, and Xiao Gu four roommates predict the results of an exam. Xiao Wang: I think everyone can live this time! Xiao Zhang: How is it possible? Didn't you see me clouded? Xiao Li: Xiao Gu is definitely fine. Xiao Gu: Please! If I'm fine, everyone will be fine. After the results are announced, it proves that only one of the four is wrong. The statement is wrong:. ['Xiao Wang.', 'Xiao Zhang.', 'Xiao Li.', 'Gu.']