This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'The semi essential amino acids is: \nSelect and explain. \nA. Arginine, B. Phenylalanine, C. Lysine, D. Tryptophan', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. ArginineSemi essential amino acids are required by lactating mothers and growing children. They are arginine and histidine.Essential amino acids are those which cannot be produced by the body and a have to be supplemented from outside diet.', 'role': 'assistant'}]