Which of the following is/are essential amino acids for humans?

P. histidine Q. tyrosine R. isoleucine S. glutamic acid

This is the correct statement. P, Q and R all are essential amino acids for humans. The indispensable amino acids or essential amino acids are those amino acids that cannot be synthesized by the organism being considered, and therefore must be supplied in its diet. The amino acids regarded as essential for humans are phenylalanine, valine, threonine, tryptophan, isoleucine, methionine, leucine, lysine, and histidine. The amino acids arginine, cysteine, glycine, glutamine, proline, serine and tyrosine are considered as conditionally essential amino acids, meaning they are not normally required in the diet, but must be supplied exogenously to specific populations that do not synthesize them in adequate amounts.