The infant also has pale skin, eczema, odd odor, and hyperreflexia

A 3-month-old child is brought to his pediatrician’s office for a check-up. On examination, the physician notices that he has a social smile, but does not hold his head up on his own or make noises. The infant also has pale skin, eczema, odd odor, and hyperreflexia. What is the most appropriate treatment for the condition the infant most likely has?

(A) A diet low in isoleucine and leucine
(B) A diet low in phenylalanine
© A diet low in tyrosine
(D) A high-protein diet
(E) Recombinant enzyme therapy