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
[{'content': 'Apa from occurring in nucleic acids, pyrimidines are also found in: \nSelect and explain. \nA. Theophylline, B. Theobromine, C. Flavin mononucleotide, D. Thiamine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Thiamine', 'role': 'assistant'}]