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
Which is non-sense codon? 
Select and explain. 
A. UGG, B. AUG, C. UGA, D. CCA
C: UGA
Answer: C: UGA 
Explanation: Non sense codons are UAA , UAG and UGA Ref-Harpers illustrated biochemistry 30/e p478