This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peptic Ulcer Disease, Subject name: Medicine
Which of the following staging is used for GERD? 
Select and explain. 
A. Ranson, B. Gleason, C. Savary miller, D. Hunter scale
C: Savary miller
Answer: C: Savary miller 
Explanation: Staging Ranson- Acute pancreatitis Gleason- Cancer of Prostate Savary miller- GERD Hunter Scale- SAH severity