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: An important test to distinguish Staphylococcus aureus from saprophytic staphylococci, such as Staphylococcus epidermidis is: 
 Options:  <1> Oxidase <2> Catalase <3> Indole. <4> Urea <5> Coagulase
