Can the Mental Retardation and Other Problems Associated with Phenylketonuria

Multiple Choice

Can the mental retardation and other problems associated with phenylketonuria be treated or prevented?

A) They are preventable by dietary intervention in infancy and childhood.
B) They are not preventable but are not fatal.
C) They are reversible if the person is put on a special diet during early childhood.
D) They are not preventable and are eventually fatal.