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
Inositic acid is biological precursor of ? 
Select and explain. 
A. Uracil and thymine, B. Purines and thy mine, C. Adenylic acid and guanylic acid, D. Orotic acid and uridylic acid
C: Adenylic acid and guanylic acid
Answer: C: Adenylic acid and guanylic acid 
Explanation: C i.e., Adenylic & guanylic acid