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: Biochemistry
[{'content': 'Epinephrine is formed from? \nSelect and explain. \nA. Methionone, B. Tyrosine, C. Valine, D. Glycine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tyrosine is the precursor for the synthesis of catecholamines namely dopamine, epinephrine and norepinephrine.', 'role': 'assistant'}]