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
In translation process, proof reading of mRNA done by 
Select and explain. 
A. RNA polymeraes, B. Amino acyl t-RNA synthetase, C. Leuicine zipper, D. DNA
B: Amino acyl t-RNA synthetase
Answer: B: Amino acyl t-RNA synthetase 
Explanation: None