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
Dihydrouridine is found in 
Select and explain. 
A. DNA, B. mRNA, C. tRNA, D. rRNA
C: tRNA
Answer: C: tRNA 
Explanation: Dihydrouridine (abbreted as D, DHU, or UH2) is a pyrimidine which is the result of adding two hydrogen atoms to a uridine, making it a fully saturated pyrimidine ring with no remaining double bonds. D is found in tRNA and rRNA molecules as a nucleoside; the corresponding nucleobase is 5,6-dihydrouracil Ref- Sathyanarayana 4/e