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
Angular cheilosis is frequently associated with deficiency of: 
Select and explain. 
A. Thiamine, B. Riboflavin, C. Niacin, D. Folic acid
B: Riboflavin
Answer: B: Riboflavin 
Explanation: None