<prompt> Answer this question truthfullyWhat are the classifications of polymyositis and dermatomyositis?  <response>: <reason> Polymyositis and dermatomyositis is one of the subtypes of idiopathic inflammatory myopathy. The 2017 European League Against Rheumatism and American College of Rheumatology EULARACR classified idiopathic inflammatory myopathy into 6 subtypes: Polymyositis Dermatomyositis Inclusion body myositis Immune-mediated necrotizing myopathies IMNM Amyopathic dermatomyositis Juvenile dermatomyositis 