Identify a true statement about phenylketonuria.
A. It is also called hypophenylalaninemia.
B. It is a rare genetic disorder that affects cell growth.
C. It causes elevation in blood phenylalanine levels.
D. It is characterized by the abundance of phenylalanine hydroxylase in blood.
E. It occurs because of the presence of high levels of tyrosine in the body.
Answer: C
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