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': "Precancerous condition of Ca stomach is - \nSelect and explain. \nA. Peptic ulcer, B. Chronic gastric atrophy, C. Achalasia cardia, D. Curling' s ulcer", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]