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': 'A 40 year old male patient complains of pins and needles sensation in the legs. Patient consumes polished rice as staple food. This patient may be suffering from deficiency of- \nSelect and explain. \nA. Vitamin C, B. Vitamin B1, C. Vitamin B2, D. Vitamin A', 'role': 'user'}, {'content': "Answer: B \nExplanation: Deficiency of vitamin B1 causes beriberi\nBeri-beri is mostly seen in populations consuming exclusively polished rice as staple food.\xa0\nThe early\xa0symptoms of thiamine deﬁciency are loss of appetite (anorexia), weakness, constipation, nausea,\xa0 mental depression, peripheral neuropathy, irritability etc.\xa0\nNumbness in the legs complaints of 'pins\xa0 and needles sensations' are reported\n\nKey Concept:\n\nDeficiency of vitamin B1 causes beri-beri\nPin and needles sensations are characteristic features of beri beri", 'role': 'assistant'}]