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: Medicine
[{'content': 'Thiamine deficiency is known to occur in all of the following, EXCEPT: \nSelect and explain. \nA. Food Faddist, B. Homocystinemia, C. Chronic alcoholic, D. Chronic hea failure patients on diuretics', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Homocystinemia is a cause of folate deficiency, not thiamine. Food Faddism, chronic alcoholism and chronic hea failure patients on diuretics are causes of thiamine deficiency. Other at-risk populations are women with prolonged hyperemesis gravidarum and anorexia, patients with overall poor nutritional status on parenteral glucose and patients after bariatric bypass surgery. Ref: Harrisons principles of internal medicine, 18th edition, Page: 869, 596', 'role': 'assistant'}]