Answer: C
Step-by-step explanation:
Phenly ketonurai (PKU) is a deficiency of Phenly alanine hydroxylase an enzyme that convert Phenlyalanine to tyrosine. So Phenlyalanine accumulate and it's level is elevated in the blood.
The best treatment is to provide special diet containing low Phenlyalanine like cassava.
The correct answer is
(C) To regulate the diet of the affected persons to severely limit the uptake of the amino acid.