This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Biochemistry
[{'content': "What is the name of this appearance which is seen in pellagra? \nSelect and explain. \nA. Burn, B. Casal's necklace, C. Shawl sign, D. Gottron's papule", 'role': 'user'}, {'content': "Answer: B \nExplanation: This is Casal's necklace shown in picture, which occurs in Vitamin B3/ Niacin deficiency. Niacin is formed from tryptophan amino acid. So, tryptophan deficiency can lead to Casal's necklace. Pellagra Etiology: Dietary deficiency of Niacin or its precursor tryptophan. C/f: Middle aged persons Pellagra: - (Dermatitis, Dementia, Diarrhea, Death) T/t: Niacinamide 300-500mg/dayorally in divided doses.", 'role': 'assistant'}]