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: Pediatrics
[{'content': 'Age criteria for JRA – \nSelect and explain. \nA. < 10 years, B. < 12 years, C. < 14 years, D. < 16 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The general rule in that :\n\n\nMyopathies have proximal muscle weakness.\n\n\nNeuropathies have distal muscle weakness.\n\n\nMyotonic dystrophy is an exception to this general rule and mainly involves the distal muscles. Also know\nThe difference between myopathy and muscular dystrophy.\nMyopathy\n\n\nAny skeletal muscle disorder that causes structural changes or functional impairment of muscle. It also includes muscular dystrophies.\n\nMuscular dystrophy\n\nThe muscular dystrophy means abnormal growth of muscle.\nIt is characterized by -\n\n\nIt is a primary myopathy iii) Course is progressive\nIt has genetic basis\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 iv) Degeneration & Death of muscle fibers occur at some stage of the disease\n\n\nSo, muscular dystrophy is a type of myopathy.', 'role': 'assistant'}]