This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
The discovery of "gene transformation" came from the study of one of the following bacteria? 
Select and explain. 
A. Bacillus subtilis, B. Streptococcus pyogenes, C. Streptococcus pneumoniae, D. Escherichia coli
C: Streptococcus pneumoniae
Answer: C: Streptococcus pneumoniae 
Explanation: 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