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B
Bivalvia
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C
Scaphopoda
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D
Gastropoda
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Solution
The correct option is CBivalvia Pinctada is a genus of saltwater clams which are marine organisms. They are called as bivalve molluscs and belong to the family Pteriida. These are the organisms which are called as pearl oysters. These oysters have a strong inner shell layer composed of nacre. The nacre is also known as mother of pearls. The nacre is stimulated and the tissue secreted a fluid which is deposited to form the pearl.