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: Medicine
All of the follwing types of Renal Stones are Radiopaque, Except: 
Select and explain. 
A. Oxalate, B. Uric Acid, C. Cystine, D. Mixed
B: Uric Acid
Answer: B: Uric Acid 
Explanation: Answer is B (Uric Acid): Uric acid stones are characteristically Radiolucent