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': 'Deficiency of which vitamin causes glossitis, dementia, roughed keratotic areas on skin and gastrointestinal symptoms? \nSelect and explain. \nA. Riboflavin, B. Pyridoxine, C. Niacin, D. Pantothenic acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]