A person with phenylketonuria cannot metabolise phenylalanine. Which sweetener must this person avoid because its hydrolysis releases that amino acid?

ASaccharin
BAspartame
CSucralose
DAlitame

Answer: B

Aspartame is the methyl ester of the dipeptide of aspartic acid and phenylalanine, so its breakdown releases phenylalanine. Saccharin and sucralose contain no amino acid unit.

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