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: Social & Preventive Medicine
Semi essential Amino acid 
Select and explain. 
A. Valine, B. Phenylalanine, C. Histidine, D. Glycine
C: Histidine
Answer: C: Histidine 
Explanation: 10 Essential Amino Acids

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