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: Contact dermatitis is mediated by: 
 Options:  <1> IgE <2> IgG <3> Activated eosinophils. <4> Activated NK lymphocytes. <5> Activated Th1 lymphocytes.
