This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mutations & Codons, Subject name: Biochemistry
[{'content': 'All of the following are synonymous codon pair EXCEPT \nSelect and explain. \nA. CAU & CAC, B. AUU & AUC, C. AUG & AUA, D. AAU & AAC', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Synonymous codons Codons that specify the same amino acids. E.g- GGA, GGG, GGU, and GGC codes for glycine Methionine is coded by AUG only. So, there is no synonymous codon for methionine.', 'role': 'assistant'}]