This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Semiessential amino acid is: 
Select and explain. 
A. Arginine, B. Lysine, C. Glycine, D. Phenylalanine
A: Arginine
Answer: A: Arginine 
Explanation: Essential, semiessential and non essential amino acids.

Essential: Those amino acids which cannot be synthesised in the body. Hence these amino acids are to be supplied in the diet. 
Semiessential: Growing children require them in the food, but not essential in adults. 
Nonessential: Amino acids which can be synthesised in the body, hence not required in the diet.