This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Medicine
[{'content': 'Angular oral fissures is treated with- \nSelect and explain. \nA. Riboflavin, B. Pyridoxine, C. Cynocobalamine, D. Vitamin C', 'role': 'user'}, {'content': 'Answer: A \nExplanation: riboflavin deficiency causes glossitis , angular stomatitis, cheilosis Ref Harrison 20th edition pg 97e', 'role': 'assistant'}]