Teacher: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'.
Teacher: Now, understand the problem? Solve this instance: Question: Th1 lymphocytes:
Options: <1> Activate B lymphocytes and eosinophils. <2> Activate macrophages and NK lymphocytes. <3> They secrete mainly IL-4. <4> They promote the production of IgE. <5> They are a type of Treg lymphocytes.
Student:
2