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
Beefy red and painful tongue is characteristic of 
Select and explain. 
A. Vitamin A deficiency, B. Any periodontal disease, C. Acute nicotinic acid deficiency, D. Ascorbic acid deficiency
C: Acute nicotinic acid deficiency
Answer: C: Acute nicotinic acid deficiency 
Explanation: None