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
Pseudouridine found in 
Select and explain. 
A. DNA, B. rRNA, C. mRNA, D. tRNA
D: tRNA
Answer: D: tRNA 
Explanation: Pseudouridine (abbreted by the Greek letter psi- Ps) is an isomer of the nucleoside uridine in which the uracil is attached a carbon-carbon instead of a nitrogen-carbon glycosidic bond. It is the most prevalent of the over one hundred different modified nucleosides found in RNA. Ps is found in all species and in many classes of RNA. Ref-Harpers illustrated biochemistry 30/e p649