<prompt> False regarding NK cells:NK cell activity is augmented by interferonsInitial response in viral infectionActive against tumour cellsMHC restricted  <response>: ans-DRef: Ananthanarayan, Paniker CJ. Textbook of Microbiology. 8th Edition. London: John Wiley Sons: 2009. Pg. 131Explianation:Natural killer cellsNatural killer cells possess spontaneous cytotoxicity towards various target cells such as malignant and virus infected cells.Their cytotoxicity is NOT antibody dependent or MHC restricted.NK cell activity is natural or nonimmune as it does not require sensitisation by prior antigenic contact.NK cells form part of the innate immune setup.They belong to a different lineage from T and B cells.They have CD16 and CD56 on their surface.NK cell activity is augmented by interferons. 