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
Bald tongue of Sandwith is seen in 
Select and explain. 
A. Vitamin B12 deficiency, B. Pellagra, C. Folic acid deficiency, D. All of the above
B: Pellagra
Answer: B: Pellagra 
Explanation: None