Concept:Non-essential amino acids are those that the human body can synthesize on its own, so they do not need to be obtained directly from the diet.
Explanation:Amino acids are the building blocks of proteins. They are classified into two groups based on whether the body can produce them.
Essential amino acids cannot be made by the body and must come from food. Examples include phenylalanine, lysine, and threonine.
Non-essential amino acids can be synthesized by the body from other compounds. Tyrosine is one such amino acid; it is made from phenylalanine in the liver.
Therefore, among the options, tyrosine is the only non-essential amino acid. The other three options are all essential amino acids.
Answer:Option A. Tyrosine
