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
In primary idiopathic polymyositis, the following group of muscles is almost never affected - 
Select and explain. 
A. Proximal limb girdle muscles, B. Pharyngeal muscles, C. Extensor neck muscles, D. Ocular muscles
D: Ocular muscles
Answer: D: Ocular muscles 
Explanation: None