The discovery of "gene transformation" came from the study of one of the following bacteria?

transformation is the transfer of genetic information through the agency of free DNA .it was the first eg of genetic exchange in bacteria to have been discoverd . griffith in 1928 found that mice died when injected with a mixture of live non capsulated pneumococci and heat killed capsulated pneumococci neither of which separately proved fatal REF:Ananthanarayan & Panicker's Textbook of Microbiology 8th edition pg no:63