<prompt> Essential amino acid amongst the following -ValineLysineThreonineAll  <response>: Ans. is 4d i.e.. All Nutritionally Essential Nutritionally Nonessentiai Arginine - semi essential Alanine Histidine Asparagine Isoleucine Asparatate Leucine Cysteine Lysine Glutamate Methionine Glutamine Phenylalanine Glycine Threonine Praline Tryptophan Serine Valine Tyrosine 