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: Pathology
[{'content': 'Beefy red and painful tongue is characteristic of \nSelect and explain. \nA. Vitamin A deficiency, B. Any periodontal disease, C. Acute nicotinic acid deficiency, D. Ascorbic acid deficiency', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]