This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Apa from occurring in nucleic acids, pyrimidines are also found in: 
Select and explain. 
A. Theophylline, B. Theobromine, C. Flavin mononucleotide, D. Thiamine
D: Thiamine
Answer: D: Thiamine 
Explanation: D i.e. Thiamine