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': 'Aneuploidy is seen with all except: \nSelect and explain. \nA. Trisomy of chromosome 18 and 13, B. Trisomy 21, C. Klinefelter syndrome, D. DiGeorge syndrome', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aneuploidy is the number of chromosomes which is not an exact multiple of haploid number e.g. hypodiploid or 2N-1 (45 chromosomes) monosomy, hyperdiploid or 2N+1 (47 chromosomes) trisomy.\nCommon syndromes with numerical aberrations:\n\nDown’s syndrome: Trisomy 21\xa0\nKlinefelter’s syndrome: Sex chromosome trisomy -\xa047, XXY\nTurner’s syndrome: Monosomy (45, X0)\n\nDiGeorge syndrome, also known as 22q11.2 deletion syndrome, is a syndrome caused by the deletion of a small segment of chromosome 22.\xa0\nMohan H. Textbook of pathology. Jaypee Brothers Medical Publishers; 2015. Edition 7. Page 253', 'role': 'assistant'}]