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: Medicine
[{'content': 'Which of the following metal ions is associated with secondary Parkinsonism - \nSelect and explain. \nA. Mangnese (Mn), B. Magnesium (Mg), C. Selenium (Se), D. Molybdenum (Mo)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Mangnese (Mn)Manganese ion exposure is implicated in free radical damage of the basal ganglia causing Parkinsonism.', 'role': 'assistant'}]