This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Which of the following compounds is an analogue of hypoxanthine? 
Select and explain. 
A. Arabinoside C, B. Allopurinol, C. Ribose phosphate, D. 5-phosphoribosylpyrophosphate (PRPP)
B: Allopurinol
Answer: B: Allopurinol 
Explanation: Allopurinol acts on purine catabolism, without disrupting the biosynthesis of purines. It reduces the production of