This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malnutrition, Subject name: Pediatrics
[{'content': 'This is seen due commonly due to deficiency of: \nSelect and explain. \nA. Vitamin B1, B. Vitamin B2, C. Niacin, D. Vitamin B12', 'role': 'user'}, {'content': 'Answer: B \nExplanation: * The given picture shows lesions at angles of mouth (angular cheilitis)- deficiency of vitamin B2 (Riboflavin). * Other features of vitamin B2 deficiency include glossitis, magenta tongue and geographic tongue . * Also have Corneal vascularisation * Image showing corneal vascularisation in vitamin B2 deficiency Cassal necklace--> niacin def. Acrodermatitis enteropathica--> zinc def. Xanthurenic aciduria--> Pyridoxine def.', 'role': 'assistant'}]