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: Pathology
[{'content': 'Perifasicular atrophy of muscle fibres is seen in? \nSelect and explain. \nA. Dermatomyositis, B. Steroid myopathy, C. Inclusion body myositis, D. Viral myositis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A distinctive feature of dermatomyositis is atrophy and degeneration of myofibres at the periphery of fasicles (perifasicular) which occurs even in the absence of inflammation.', 'role': 'assistant'}]