This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Specific Cytogenetic Disorders, Subject name: Pathology
[{'content': 'Maternal disomy of chromosome 15 is seen in which of the following? \nSelect and explain. \nA. Prader-Willi syndrome, B. Klinefelter syndrome, C. Angelman syndrome, D. Turner syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Prader Willi syndrome could be present because of the following: Deletion of paternal chromosome 15. Uniparental disomy of maternal chromosome 15. SNORP mutation', 'role': 'assistant'}]