This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Which is non-sense codon? \nSelect and explain. \nA. UGG, B. AUG, C. UGA, D. CCA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Non sense codons are UAA , UAG and UGA Ref-Harpers illustrated biochemistry 30/e p478', 'role': 'assistant'}]