The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which disease affects neurons only   (A) Spinocerebellar ataxia   (B) Supranuclear palsy   (C) Corticobasillar degeneration   (D) Multiple system atrophy
['(A) Spinocerebellar ataxia <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Spinocerebellar ataxia \n (B) Supranuclear palsy \n (C) Corticobasillar degeneration \n (D) Multiple system atrophy <> possible answers', '  Which disease affects neurons only <> context@']