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
A11 are processing reactions in t-RNA except 
Select and explain. 
A. CCA tailing, B. Methylation of bases, C. Poly (A) tailing, D. Trimming of 5' end
C: Poly (A) tailing
Answer: C: Poly (A) tailing 
Explanation: C i.e. Poly (A) tailing