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
Which vitamin deficiency causes glossitis and cheilosis ? 
Select and explain. 
A. Thiamin, B. Riboflavin, C. Folic acid, D. Vitamin A
B: Riboflavin
Answer: B: Riboflavin 
Explanation: Ans. is 'b' i.e., Riboflavin