28. Lecithin is composed of _________.
(A) Glycerol + Fatty acid + Phosphoric acid + Serine
(B) Glycerol + Fatty acid + Phosphoric acid + Ethanolamine
(C) Glycerol + Fatty acid + Phosphoric acid + Betaine
(D) Glycerol + Fatty acid + Phosphoric acid + Choline
(E) None of the above
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