This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Medicine
Magenta red tongue with cheilosis is caused by deficiency of? 
Select and explain. 
A. Thiamine, B. Riboflavin, C. Cyanocobalamine, D. Ascorbic acid
B: Riboflavin
Answer: B: Riboflavin 
Explanation: Ans. B. RiboflavinNutrientClinical findingDietary level per day associated with overt deficiency in adultsContributing factors to DeficiencyRiboflavinMagenta tongue, angular stomatitis, seborrhoea, cheilosis<0.6mg-