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