Explanation:
C
Pinctada is also known as "mother of pearl". Pearls are formed when the molluscs start to secrete a lot of very thin concentric layers of nacre, a secretion of carbonate during a matrix that can coat an irritant, either artificial or natural.
Pearl is also known as moti. It's white, highly shining, a globular natural material found within the shell of an oyester which is a mollusca.