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
Parkinsonism is associated with which metal? 
Select and explain. 
A. Mg, B. Se, C. Mn, D. Mo
C: Mn
Answer: C: Mn 
Explanation: Harrison's principles of internal medicine 17th edition. *Exposure to manganese, CO,disulfides, cyanide and methanol can lead to parkinsonism