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: Microbiology
Most common cause of "Polymyositis" is 
Select and explain. 
A. Pseudomonas, B. Brucella, C. Streptococcus, D. Staphylococcus
D: Staphylococcus
Answer: D: Staphylococcus 
Explanation: Staphylococcus