The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 40-year-old male presents to your office complaining that he is too weak to climb stairs or brush his hair. He denies any headaches or change in vision. A muscle biopsy reveals CD8+ lymphocyte infiltration in the endomysium. Which of the following is the most likely diagnosis?   (A) Systemic lupus erythematosus   (B) Polymyalgia rheumatica   (C) Polymyositis   (D) Dermatomyositis
['(C) Polymyositis <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Systemic lupus erythematosus \n (B) Polymyalgia rheumatica \n (C) Polymyositis \n (D) Dermatomyositis <> possible answers', '  A 40-year-old male presents to your office complaining that he is too weak to climb stairs or brush his hair. He denies any headaches or change in vision. A muscle biopsy reveals CD8+ lymphocyte infiltration in the endomysium. Which of the following is the most likely diagnosis? <> context@']