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
[{'content': 'Semi essential Amino acid \nSelect and explain. \nA. Valine, B. Phenylalanine, C. Histidine, D. Glycine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 10 Essential Amino Acids\n\nPhenylalanine\nTryptophan\nValine\nIsoleucine\nLeucine\nLysine\nArginin\xa0 \xa0 ] - Semi\nHistidine ]\xa0 \xa0essential\nMethionine\nThreonine', 'role': 'assistant'}]