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B
Protein
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C
Steroid
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D
Lipid
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Solution
The correct option is C Protein Insulin is a small peptide (protein) consisting of fifty-one amino acids synthesized and stored within the pancreas.
It is composed of two peptide chains referred to as the A chain and B chain. Two chains are linked together by two disulfide bonds. In most of the species, the A chain consists of 21 amino acids and the B chain of 30 amino acids. It is made by beta cells of the pancreas and helps control blood glucose levels. Hence option B is correct.