During the National Games, there were 8 athletes in Building F. One of them was Heilongjiang, two were northerners, one was Cantonese, two were track and field athletes, and three were main athletes. The above situation statistics involved All 8 athletes in the F building. Which of the following contradicts the information stated in the question? ['Heilongjiang athletes are not main players;.', 'Track and field athletes are not main players;.', 'Cantonese are main players;.', 'The main players are all Southerners.']