After the CET-6, whether Wang Gang and Liu Chao can pass the exam, the dormitory students have discussed as follows: Wang Gang said: either I can pass, or Liu Chao can pass, or Liu Chao and I can pass. Will definitely pass. Yang Fan said: Liu Chao can pass. Zhao Jin said: Wang Gang could not pass. After the test results came out, it proved that two of the four words were true, and the two were false. Based on the above statement, which of the following can be derived? ['Wang Gang and Liu Chao both passed.', 'Wang Gang and Liu Chao failed.', 'Wang Gang passed, Liu Chao failed.', 'Liu Chao passed, Wang Gang failed.']