18. (6 points) In a math competition, only one of three people, A, B, and C, won. A said: "I won." B said: "I didn't win." C said: "A didn't win." Only one of their statements is true, then the winner is $\qquad$
18. (6 points) In a math competition, only one of Jia, Yi, and Bing won the prize. Jia said: "I won the prize." Yi said: "I didn't win the prize." Bing said: "Jia didn't win the prize." Only one of their statements is true, then the winner is $\qquad$ .

【Solution】Solution: By analysis, assume Jia is telling the truth, then Yi is also telling the truth, so it does not hold; assume Yi is telling the truth, then Jia is also telling the truth, which also does not hold;

Therefore, it can only be that Bing is telling the truth, and Yi is lying, that is: Yi won the prize; hence the answer is: Yi.