This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Dental
Dermatological menifestation of which of the following disease? 
Select and explain. 
A. Pellagra, B. Acrodermatitis enteropathica, C. Photo dermatitis, D. Vitamin B deficiency
A: Pellagra
Answer: A: Pellagra 
Explanation: Above image showsdermatitis lesion in form of necklace called Casals necklacewhich is dermatological manifestation ofPellagra This is a manifestation of vitamin B3 /NIACIN deficiency. Characterized by dermatitis, dementia and diarrhea Above image showsdermatitis lesion in form of necklace called Casals necklace