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: Cause of syphilis: 
 Options:  <1> Trichomonas vaginalis. <2> Neisseria gonorrhoeae. <3> Treponema pallidum. <4> Mycoplasma genitalium. <5> Mobiluncus curtisii.
