This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transcription, 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: Type Percentage Characteristic feature Synthesis rRNA 80% Most abundant Nucleous tRNA 15% Smallest, Maximum modified bases Nucleus mRNA 5% Most heterogenous Nucleus', 'role': 'assistant'}]