This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
[{'content': 'Which vitamin deficiency is found in gastric cancer patients? \nSelect and explain. \nA. Vitamin C, B. Vitamin B 12, C. Vitamin A, D. Vitamin D', 'role': 'user'}, {'content': "Answer: B \nExplanation: ANSWER: (B) Vitamin B 12REF: Harrison's 18th ed chapter 105Gastric cancers can growr to an extent to cause damage to cells producing intrinsic factors and hence vitamin B12 deficiencyVitamin B12 deficiency may also occur in post gastrectomy patients of gastric carcinoma, autoimmune pernicious anemia predisposing to gastric cancer and atrophic gastritis.", 'role': 'assistant'}]