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: Physiology
[{'content': 'Glossitis and cheilitis seen with which Vit. deficiency: \nSelect and explain. \nA. Vit. B2, B. Vit. B12, C. Vit. K, D. Vit D', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. B2', 'role': 'assistant'}]