This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Micronutrient Mineral Deficiencies, Subject name: Pediatrics
Keshan disease in due to deficiency of - 
Select and explain. 
A. Selenium, B. Copper, C. Zinc, D. Iron
A: Selenium
Answer: A: Selenium 
Explanation: Ans. is 'a' i.e., Selenium o Keshan diseaseCardiomyopathy associated with selenium deficiency,o Wilson diseaseAutosomal recessive.Defective metabolism of copper leads to copper toxicity.Deficiency of ceruloplasmin.Presence of KF ring in cornea,o Acrodermatitis enteropathicaDeficiency of zinc.Dermatitis of extremities & around orifices.