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[A] : When a foreign object , such as a ...

[A] : When a foreign object , such as a sand grain gets in between the shell and mantle , it results in the formation of a pearl .
[R] : The inner nacreous layer of irridiscent nacre is called the mother of pearl which is formed by many thin and alternating layers of calcium carbonate and concholin .

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 and R is false

D

If both A and R are false

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[A] : Pearl is formed when a foreign particle gets in between shell and mantle . [R] : The inner nacreous layer called mother of pearl is formed by layers of CaCO_(3) and concholin.

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