virulent S-cells + Live mice 
Mice died Virulent S-cells Non-virulent + Live mice Mice No bacteria Heat killed S-cells + Live mice Mice Lives No bacteria 
A) A - Non, B - dies, C - dies
B) A- W, B - lives, C - dies
C) A - Live, B - lives, C - dies
D) A - Non, B - lives, C - dies
Correct Answer: C
Solution :
When live S-type cells were injected into mice; they died due to pneuomonia. When live R-type cells were injected into mice; they survived. When heat killed S-type cells were mixed with R-type cells were injected) they died due to unexpected symptoms.
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