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: Pathology
Hemochromatosis is a defect in metabolism of ? 
Select and explain. 
A. Iron, B. Copper, C. Magnesium, D. Calcium
A: Iron
Answer: A: Iron 
Explanation: Ans. is `a' i.e., Irono Hemochromatosis is characterized by the excessive accumulation of body iron, most of which is deposited in parenchymal organs such as the liver and pancreas.