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': 'Maximum number of unusual base pairs are seen in \nSelect and explain. \nA. rRNA, B. tRNA, C. mRNA, D. snRNA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The transfer RNA show extensive internal base pairing and acquire clover leaf like structures. They contain a significant propoion of unusual bases. These include dihydrouracil (DHU) pseudouridine (Ps) and hypoxanthine. Moreover, many bases are methylated. REFERENCE : DM.VASUDEVAN.TEXTBOOK SEVENTH EDITION ; PAGE NO : 596.', 'role': 'assistant'}]