Regarding Natural Killer Cell, all are true except?: (A) It is activated by IL-2, (B) CD-56 positive, (C) Antibody induced proliferation, (D) Variant of large lymphocyte
Answer is C. Natural Killer Cells (or NK cells) are a type of cytotoxic lymphocyte critical to the innate immune  system.
NK cells play is analogous to that of cytotoxic T cells in the vertebrate adaptive immune response.  
CD 56 and CD 16 positive.
Special action against viruses and tumor cells.