(A) : Ethidium bromide is a known mutagen.
(R) : It can be used to stain DNA and visualise by exposure to UV radiation.

Options

A. If both (A) and (R) are true and (R) is the correct explanation of (A).
B. If both (A) and (R) are true but (R) is not the correct explanation of (A).
C. If (A) is true but (R) is false.
D. If both (A) and (R) are false.

Answer

B