Microbiology Immunology ea5cd70b Not true regarding NK cells - A Active against malignant cells B Inactive MHC antigen for killing microorganisms C First line defense against viral infections D No prior sensitization required High-Yield Explanation NK cell's cytotoxicity is not antibody dependent or MHC restricted :NK cellsNatural killer cells Reff: Anantharayan & Panikers textbook f microbiology 9th edition pg:137