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: Surgery
[{'content': 'A pt. of peptic ulcer disease. When investigated endoscopically showed chronic antral gastritis. Which of the following dye will be able to stain the specimen \nSelect and explain. \nA. PAS, B. Zeil-Neilson stain, C. Gram stain, D. Warthin-Starry stain', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]