This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Parkinsonism is associated with which metal? \nSelect and explain. \nA. Mg, B. Se, C. Mn, D. Mo', 'role': 'user'}, {'content': "Answer: C \nExplanation: Harrison's principles of internal medicine 17th edition. *Exposure to manganese, CO,disulfides, cyanide and methanol can lead to parkinsonism", 'role': 'assistant'}]