This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Biochemistry
Keshan's disease is due to deficiency of: 
Select and explain. 
A. Selenium, B. Zinc, C. Copper, D. Iron
A: Selenium
Answer: A: Selenium 
Explanation: Keshan's Disease Deficiency of Selenium (Se) Affects: Children Women of child bearing age CLINICAL FEATURES: Cardiomyopathy Muscle weakness Hypothyroidism Eczema Increased risk of stroke Hypeension Cancer Selenium Sources- seafood and meat, nuts Deficiency - Keshan's disease Toxicity - Selenium toxicity lead to Selenosis