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': 'Which is not cytogenetic abnormality in myclodysplastic syndrome \nSelect and explain. \nA. Chromosome 5q deletion, B. Monosomy 7, C. Trisomy 8, D. Chromosome 20q deletion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Solution:\nAdult\xa0→ 5q deletion\nPediatric\xa0→ monosomy 7\nTrisomy 8\xa0→ 3 copies of MYC gene\nThese three are common genetic defects of MDS.', 'role': 'assistant'}]