The correct option is
D Phospholipid
Lecithin is a conjugated protein where phosphorous is present as a prosthetic group. It is a mixture of glycerophospholipids including phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, and phosphatidic acid. Phosphatidylcholine forms an important component of the phospholipid portion of the cell membrane. It helps to lower the cholesterol level.
So, the correct answer is option D.