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': 'Water soluble vitamins are  not stored in  the  body  in  large quantities except: \nSelect and explain. \nA. Vitamin B12, B. Vitamin B1, C. Vitamin B10, D. Vitamin B2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Water soluble vitamins:\n\nMost of these vitamins are readily excreted in urine and they are not toxic to the body.\xa0\nWater soluble vitamins are not stored in the body in large quantities (except B12).\xa0\nFor this reason, they must be continuously supplied in the diet.\xa0\nThe water soluble vitamins form coenzymes that participate in a variety of biochemical reactions, related to either energy generation or hematopoiesis.\nThe common symptoms of the deficiency of one or more vitamins involved in energy metabolism include dermatitis, glossitis (red and swollen tongue), cheilitis (rupture at the corners of lips), diarrhea, mental confusion, depression and malaise.\nDeficiency of vitamins\xa0 B1, B6 and B12 is more closely associated with neurological manifestations\xa0\n\nKey Concept:\nVitamin B12 is the only water soluble vitamin that is stored in the body.\nRef : Textbook of Biochemistry, Satyanarayana', 'role': 'assistant'}]