Lysine and tryptophan are
The correct option is (A)essential amino acids
Amino acids are the building blocks of proteins. Amino acids are organic compounds which combine to form protein. These biomolecules help to perform various chemical and biological functions in the human body, which helps in growth and development. Amino acids play an important role in the formation of enzymes and help in digestion, etc. Amino acids are classified into essential amino acids and non-essential amino acids.
Non-essential amino acids are the amino acids that can be synthesised in the human body naturally. The role of non-essential amino acids is to promote brain function, remove toxins, be an integral part of the production of RBC and WBC, etc. Some examples of non-essential amino acids are alanine and glycine.
Essential amino acids are the amino acids that cannot be synthesised in the human body and should be supplemented in the diet. The role of essential amino acids is that they form the precursor molecules for the production of neurotransmitters in the brain, serve to repair and build muscle tissues, etc. Some examples of essential amino acids are tryptophan, valine and lysine.
Final answer: Option (A) Essential amino acids.