Maggie was a subject in a clinical study that was designed to determine the effects of certain diets on health. While participating in the study, she was given a synthetic formula diet that provided vitamins, minerals, egg protein, purified water, and potato starch. Within a few weeks, Maggie's hair began to fall out and she developed patches of scaly skin on her arms and legs. Which of the following substances should be added to her formula to treat her nutritional deficiency?
A. Essential fatty acids
B. Cholesterol esters
C. Glucose polymers
D. Bile salts
Answer: A
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