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': 'Helper T-cells are primarily involved in ? \nSelect and explain. \nA. Cell mediated immunity, B. Killing virus infected cells, C. Killing tumor cells, D. Involved in type II hypersensitivity', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Cell mediated immunity The main types of B cells are plasma cells, plasmablasts, memory B cells, and regulatory B cells. T cells are involved in cell-mediated immunity, whereas B cells are primarily responsible for humoral ( antibody -related) immunity.", 'role': 'assistant'}]