This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nucleotides, Subject name: Biochemistry
[{'content': 'Inosine is biological precursor of: \nSelect and explain. \nA. Orotic acid and Uridylic acid, B. Uracil and Thymine, C. Adenylic acid, Guanylic acid, D. Purines and Thymine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: IMP (Inosine Mono Phosphate) the first purine nucleotide to be formed. It is the parent nucleotide which synthesize AMP & GMP and then diphosphate and triphosphate forms can be synthesized.', 'role': 'assistant'}]