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
DNA and RNA both contain which pyrimidine base? 
Select and explain. 
A. Uracil, B. Thymine, C. Cytosine, D. Guanine
C: Cytosine
Answer: C: Cytosine 
Explanation: Thymine is a pyrimidine base present in both DNA and RNARef: D.M.Vasudevan 7th edition, page no: 560