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
Risk factor for carcinoma stomach are all, EXCEPT: 
Select and explain. 
A. Blood group A, B. Postgastrectomy, C. Adenomatous polyp, D. Atrophic gastritis
A: Blood group A
Answer: A: Blood group A 
Explanation: Impoant quotes (Maingot's 10/e, Page 1007): In several large studies from the scandinan countries, it was found that there is no correlation between gastric cancer and blood group A. Ref: Maingot's 10/e, Page 1007.