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: Skin
[{'content': 'A 40 year old woman presented with a 8 month history of erythema and swelling of the periorbital region & papules & plaques on the dorsolateral aspect of forearms & knuckles with ragged cuticles. There was no muscle weakness. The most likely diagnosis is: \nSelect and explain. \nA. SLE, B. Dermatomyositis, C. Systemic sclerosis, D. Mixed connective tissue disorder', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Dermatomyositis', 'role': 'assistant'}]