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': 'Which of the following is a Semi-essential aminoacid- \nSelect and explain. \nA. Tyrosine, B. Histidine, C. Alanine, D. Isoleucine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Histidine* Histidine is a semiessential aminoacid, as this aminoacid can be synthesized by metabolic pathways in human. But the synthetic rate is not sufficient enough to meet the increased demands during growth spurts.* Tyrosine and Alanine are non essential aminoacids* Isoleucine is an essential aminoacid", 'role': 'assistant'}]