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': "A11 are processing reactions in t-RNA except \nSelect and explain. \nA. CCA tailing, B. Methylation of bases, C. Poly (A) tailing, D. Trimming of 5' end", 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Poly (A) tailing', 'role': 'assistant'}]