The correct option is D A : Lecithin - a component of cell membrane
Lecithin is a component of cell membrane and are mixtures of Glycerophospholipids including phosphatidylcholine, Phosphatidylethanolamine, phophosphatidylinositol ,Phosphatidylserine, Phosphatidic acid
So, the correct answer is 'Lecithin - a component of cell membrane'