<prompt> True about MHC class IINot involved in innate immunityCytotoxic T cell involvedPresent in nucleated cellsPresent in B cells  <response>: Ref Robbins 7e p203; 9e p194-195 The main function of major histocompatibility complex MHC class IImolecules is to present processed antigens, which are derived primarily from exogenous sources, to CD4 T-lymphocytes. MHC class II molecules thereby are critical for the initiation of the antigen-specific immune response. 