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
Precancerous condition of Ca stomach is ? 
Select and explain. 
A. Peptic ulcer, B. Chronic gastric atrophy, C. Achalasia cardia, D. Curling's ulcer
B: Chronic gastric atrophy
Answer: B: Chronic gastric atrophy 
Explanation: Answer 'b' i.e. Chronic gastric atrophy