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': 'Chain initiation in protein synthesis is by \nSelect and explain. \nA. AUG, B. GLA, C. UGA, D. UAG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Initiation codon AUG codes for methionine.', 'role': 'assistant'}]