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
[{'content': 'All are indicators of active bleeding from varices during endoscopy, EXCEPT: \nSelect and explain. \nA. Active bleeding from a varix, B. White nipple overlying a varix, C. Clots overlying a varix, D. Yellow nipple', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Classification of the varices: Size of varix Two-size classification Three-size classification 1. Small < 5 mm Minimally elevated veins above the esophageal mucosal surface 2. Medium Touous veins occupying less than one-third of the esophageal lumen 3. Large > 5 mm Occupying more than one-third of the esophageal lumen Variceal hemorrhage is diagnosed on the basis of one of the following findings on endoscopy: Active bleeding from a varix White nipple overlying a varix Clots overlying a varix Varices with no other potential source of bleeding Ref: WGO Practice Guidelines Esophageal varices', 'role': 'assistant'}]