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: Biochemistry
[{'content': 'Most dietary deficiency of thiamine is the result of poor dietary intake. Thiamine requirement increases in excessive intake of: \nSelect and explain. \nA. Carbohydrate, B. Amino acid, C. Fat, D. Lecithine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Primary food sources for thiamine include yeast, organ meat, pork, legumes, beef, whole grains, and nuts. Milled rice and grains contain little thiamine, if any. Thiamine deficiency is therefore more common in cultures that rely heavily on a rice-based diet. Tea, coffee (regular and decaffeinated), raw fish, and shellfish contain thiaminases, which can destroy the vitamine. Thus, drinking large amounts of tea or coffee can theoretically lower thiamine body stores. Ref: Russell R.M., Suter P.M. (2012). Chapter 74. Vitamin and Trace Mineral Deficiency and Excess. In D.L. Longo, A.S. Fauci, D.L. Kasper, S.L. Hauser, J.L. Jameson, J. Loscalzo (Eds), Harrison's Principles of Internal Medicine, 18e.", 'role': 'assistant'}]