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
The following rashes seen in a previously well 5 month old child can be treated by administration of 
Select and explain. 
A. Calcium, B. Pyridoxine, C. Niacin, D. Zinc
D: Zinc
Answer: D: Zinc 
Explanation: Deficiency of zinc leads to Acrodermatitis enteropathica -rashes seen especially around the orifices. Acrodermatitis enteropathica is a genetic AR disorder Characterized by periorificial dermatitis, alopecia, and diarrhea. Caused by mutations in the gene that encodes a membrane protein that binds zinc in the intestine. Treatment - Oral zinc supplementation