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
Patients at increased risk for gastric carcinoma include all the following EXCEPT 
Select and explain. 
A. Those who have undergone gastric resection for duodenal ulcer, B. Those with pernicious anemia, C. Those who have andergone gastric bypass for morbid obesity, D. Those with blood group A
C: Those who have andergone gastric bypass for morbid obesity
Answer: C: Those who have andergone gastric bypass for morbid obesity 
Explanation: Patients with pernicious anemia who have atrophic gastritis are at increased risk. Patients with blood group A are also at risk, although this observation has never been explained. Carcinoma may develop in the gastric remnant many years after gastric resection for duodenal ulcer, probably on the basis of bile-induced gastritis. Gastric cancer is not recognized as a complication of gastric bypass procedures.