Assertion : The mantle of pearl oyster is three - layered.
Reason : Nacre- secreting cells are present just below the nacreous layer .
A. If both assertion & reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both assertion & Reason are true but the reason is not the correct explanation of the assertion, them mark (2).
C. If assertion is true statement but reason is false, them mark (3).
D. If both assertion and reason are false statements, them mark (4).
