Multiple choice general knowledge science & technology Defeciency of which Vitamin causes Cheilosis B12 D B2 A Reveal answer Fill a bubble to check yourself C Correct answer Explanation Cheilosis, characterized by cracks and inflammation at the corners of the mouth (angular stomatitis), is a classic sign of Vitamin B2 (riboflavin) deficiency. This condition is one of the most common manifestations of B-complex vitamin deficiencies.