Assertion : `ZnO` becomes yellow when it is beated
Reason: `NaCI` becomes yellow when heater in the presence of Na vapours due to anion vacancy
A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true bur reason is false
D. If assertion is false bur reason is true
