This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'All of the following are functions of CD4 helper cells except: \nSelect and explain. \nA. Immunogenic memory, B. Produce Immunoglobulins, C. Activate macrophages, D. Activate cytotoxic cells.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Immunoglobulins are secreted from the B lymphocytes. however, T helper cells helps the B cells, by activating it and produce into plasma cells. These plasma cells secrete the immunoglobulins. Thus, T helper cells indirectly helps in secretion of immunoglobulins. Ref: Andrew E. Williams, "The immune system", In the book, "Immunology: Mucosal and Body Surface Defences", USA, Wiley Blackwell Publications, Chapter 1.13; Medical Microbiology By Jawetz , 24th Edition, Page 140; Medical Microbiology By Muray, 6th Edition, Pages 119-20; Review of Microbiology and Immunology, 9th Edition, Page 405', 'role': 'assistant'}]