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': 'Regarding Natural Killer Cell, all are true except? \nSelect and explain. \nA. It is activated by IL-2, B. CD-56 positive, C. Antibody induced proliferation, D. Variant of large lymphocyte', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Natural Killer Cells (or NK cells) are a type of cytotoxic lymphocyte critical to the innate immune\xa0 system.\nNK cells play is analogous to that of cytotoxic T cells in the vertebrate adaptive immune response.\xa0\xa0\nCD 56 and CD 16 positive.\nSpecial action against viruses and tumor cells.', 'role': 'assistant'}]