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': 'Amber codon refers to \nSelect and explain. \nA. Mutant codon, B. Stop codon, C. Initiating codon, D. Codon for more than one amino acids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Stop codons UAA - ochre; UAG - amber; UGA - opal.', 'role': 'assistant'}]