This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Biochemistry
[{'content': 'Essential amino acids are all except: \nSelect and explain. \nA. Leucine, B. Lysine, C. Methionine, D. Proline', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 10 amino acid are essential - T - Threonine V -VALINE P- Phenylalanine A- Arginine T- Tryptophan M- Methionine I -Isoleucine L -Leucine L - Lysine 2 amino acid are semi essential -Arginine and histidine can be synthesized by adults and not by growing children', 'role': 'assistant'}]