This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Pathology
[{'content': 'Which of the following cytokines are not secreted by Th2 type of helper T-cells? \nSelect and explain. \nA. IL-1, B. IL-4, C. IL-5, D. IL-13', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Th2 type of helper T-cells Secrete IL-4, IL-5, IL-13 IL-4 stimulate Th2 cells Th2 cells in turn cause stimulation of IgE production, activation of mast cells and eosinophils Mainly involved in allergies and defense against helminthic infestations', 'role': 'assistant'}]