This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Essential amino acids are A/E - \nSelect and explain. \nA. Leucine, B. Proline, C. Lysine, D. Methionine', 'role': 'user'}, {'content': "Answer: B \nExplanation: - essential aminoacid are the one that cannot be synthesised in the body corresponding to the needs. Thus need to be supplied through diet. - they are leucine, isoleucine, lysine, methionine, phenylalanine, threonine, valine, tryptophan and histidine. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:609 <\\p>", 'role': 'assistant'}]