Semi essential Amino acid: (A) Valine, (B) Phenylalanine, (C) Histidine, (D) Glycine
Answer is C. 10 Essential Amino Acids

Phenylalanine
Tryptophan
Valine
Isoleucine
Leucine
Lysine
Arginin    ] - Semi
Histidine ]   essential
Methionine
Threonine