Which one of the following amino acids is an essential part of human diet ?

Q. Which one of the following amino acids is an essential part of human diet ?
A. Glycine
B. Phenylalanine
C. Serine
D. Aspartic acid
Answer: Phenylalanine

A. Glycine
B. Phenylalanine
C. Serine
D. Aspartic acid
Answer: Phenylalanine