This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'True about gastric stump carcinoma \nSelect and explain. \nA. Enterogastric reflex is the cause, B. Prognosis good after surgery, C. It is always adenocarcinoma in nature, D. Diffuse type is only variety', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Usually, after Billroth II operation altered acid level, enterogatric bile reflux is the pathogenesis which increases the peptic activity causing mucosal metaplasia and dysplasia resulting in stump carcinoma Reference SRB edition:5 page:845', 'role': 'assistant'}]