Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: When performing the Ames test, what result would reveal that the compound is a mutagen? 
 Options:  <1> Abnormal division in mouse uterus cells. <2> Abnormal growth in mouse. <3> Proliferation of a hamster ovary cell culture. <4> Reversal in the growth characteristics of Salmonella. <5> No option is correct.
