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
[{'content': 'Keshan disease is manifestation of? \nSelect and explain. \nA. Selenium excess, B. Zinc excess, C. Selenium deficiency, D. Zine deficiency', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Keshan disease is endemic cardiomyopathy due to selenium deficiency.', 'role': 'assistant'}]