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 one of the following disorders is due to maternal disomy of chromosome 15? \nSelect and explain. \nA. Prader -Willi syndrome, B. Angelman syndrome, C. Hydatidiform mole, D. Klinefelter's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Prader -Willi syndrome', 'role': 'assistant'}]