This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
Which vitamin deficiency cause glossitis and cheilosis? 
Select and explain. 
A. Thiamine, B. Riboflavin, C. Folic acid, D. Vitamin A
B: Riboflavin
Answer: B: Riboflavin 
Explanation: Deficiency of Vit B2(riboflavin)causes cheilosis and glossitis. Cheilosis: Lesions at the mucocutaneous junction at the angles of the mouth leading to painful fissures are characteristic. *Tongue: Painful glossitis, the tongue assuming a red-purple (magenta) colour. *Seborrhoeic dermatitis: Scaly, greasy, desquamationReference: Chatterjea Textbook of Biochemistry pg no: 178