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
Which is the most common symptom of medullary sponge kidney disease? 
Select and explain. 
A. Anuria, B. Anemia, C. Azotemia, D. UTI
D: UTI
Answer: D: UTI 
Explanation: Patients with this condition typically maintain normal renal function through adulthood Complications include nephrolithiasis, pyelonephritis, hyposthenuria (inability to concentrate urine), and distal A.