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': 'Perifascicular atrophy of muscle fibres is seen in - \nSelect and explain. \nA. Steroid myopathy, B. Dermatomyositis, C. Inclusion body myositis, D. Nemaline myopathy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dermatomyositis is a connective-tissue disease related to polymyositis that is characterized by inflammation of the muscles and the skin.\nIt is a systemic disorder that may also affect the joints, the esophagus, the lungs, and, less commonly, the heart.\nOn the muscle biopsy, there are two classic microscopic findings of dermatomyositis. They are : mixed B- & T-cell perivascular inflammatory infiltrate and perifascicular muscle fiber atrophy.\nIt is associated with autoantibodies, especially anti-Jo 1\xa0antibody.', 'role': 'assistant'}]