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
[{'content': 'Which type of RNA has the highest percentage of modified base? \nSelect and explain. \nA. mRNA, B. tRNA, C. rRNA, D. snRNA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The transfer RNAs show extensive internal base pairing and acquire cloverleaf-like structureThey contain significant propoion of unusual basesThese include dihydrouracil, pseudouridine, and hypoxanthineRef: DM VASUDEVAN, 7th edition, page no: 596,597', 'role': 'assistant'}]