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: Which of the following bacterial species is not an Enterobacteriaceae? 
 Options:  <1> Escherichia coli <2> Proteus vulgaris. <3> Klebsiella pneumoniae. <4> Pseudomonas aeruginosa. <5> Salmonella enteritidis.
