Janaka's two-year-old daughter is intellectually disordered (formerly known as mentally retarded) due, in part, to a diet that included fish, bread, and dairy products. The most likely diagnosis for Janaka's daughter is that she has
A) Turner's syndrome.
B) Huntington's disease.
C) Tay Sachs disease.
D) Phenylketonuria (PKU).

Question

Quizplus · Accepted Answer

Phenylketonuria (PKU) is a metabolic disorder caused by a deficiency in the enzyme needed to metabolize phenylalanine, an amino acid found in many foods including fish, bread, and dairy products. If untreated, it can lead to intellectual disability among other symptoms.

Janaka's Two-Year-Old Daughter Is Intellectually Disordered (Formerly Known as Mentally