This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Not a chromosoal breakage syndrome \nSelect and explain. \nA. Fragile X syndrome, B. Bloom syndrome, C. Ataxia telangiectasia, D. Duchenne muscular dystrophy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Duchenne muscular dystrophy (DMD) is a genetic disorder characterized by progressive muscle degeneration and weakness. It is one of nine types of muscular dystrophy. DMD is caused by an absence of dystrophin, a protein that helps keep muscle cells intact. Symptom onset is in early childhood, usually between ages 3 and 5. The disease primarily affects boys, but in rare cases it can affect girls.DMD has an X-linked recessive inheritance pattern and is passed on by the mother, who is referred to as acarrier.', 'role': 'assistant'}]