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
Which of the following is not a lower urinary tract infection? 
Select and explain. 
A. Cystitis, B. Prostatitis, C. Urethritis, D. Pyelonephritis
D: Pyelonephritis
Answer: D: Pyelonephritis 
Explanation: None