This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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 Keshan disease Cardiomyopathy associated with selenium deficiency. Wilson disease Autosomal recessive. Defective metabolism of copper leads to copper toxicity. Deficiency of ceruloplasmin. Presence of KF ring in cornea. Acrodermatitis enteropathica Deficiency of zinc. Dermatitis of extremities & around orifices.