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': 'Inositic acid is biological precursor of ? \nSelect and explain. \nA. Uracil and thymine, B. Purines and thy mine, C. Adenylic acid and guanylic acid, D. Orotic acid and uridylic acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e., Adenylic & guanylic acid', 'role': 'assistant'}]