An organism which is sensitive to an antibiotic is grown in the lab in a pure culture on a medium with the antibiotic , if we see colonies of the organism growing on the plate then it must have undergone

A. transpoon muagenesis
B. Spontaneous mutation
C. natural selection
D. x ray induced mutation

The VP test is used to differentiate

A. Gram positive organisms
B. Gram negative organisms
C. Klebsiella vs Enterobacter
D. Genus of Enterobacteriaceae family