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: Surgery
Which of the following is radiolucent stone 
Select and explain. 
A. Calcium oxalate, B. Struvite, C. Cystine, D. Uric acid stones
D: Uric acid stones
Answer: D: Uric acid stones 
Explanation: Uric acid stones are radiolucent. These are seen in during increased uric acid production such as tumor lysis
syndrome.