This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Polycystic Kidneys, Subject name: Medicine
A 40-year-old man has been diagnosed with autosomal dominant polycystic kidney disease. How should the cysts be present in USG to call it ADPKD? 
Select and explain. 
A. 1 cyst per kidney, B. 2 cysts per kidney, C. 3 cysts per kidney, D. 4 cysts per kidney
B: 2 cysts per kidney
Answer: B: 2 cysts per kidney 
Explanation: Diagnostic criteria for ADPKD Age (years ) Number of Cysts 15-29 2 renal cysts (unilateral or bilateral) 30-59 2 cysts per kidney >60 4 cysts per kidney