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: Biochemistry
Keshan disease is manifestation of? 
Select and explain. 
A. Selenium excess, B. Zinc excess, C. Selenium deficiency, D. Zine deficiency
C: Selenium deficiency
Answer: C: Selenium deficiency 
Explanation: Keshan disease is endemic cardiomyopathy due to selenium deficiency.