Step 1: Understanding the Concept
Amino acids are essential if the body cannot synthesize them and non-essential if it can.
Step 2: Check the Options
Tyrosine, glutamine and glycine are non-essential and are made in the body.
Step 3: Result
Tryptophan is an essential amino acid, so it must come from food.
Final Answer:
Tryptophan is not synthesized in the body.
\[ \boxed{\text{(B) }\text{Tryptophan}} \]