This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': "Maternal chromosome 15 disomy results in \nSelect and explain. \nA. Prader Willi Syndrome, B. Fragile x syndrome, C. Marfan's syndrome, D. Angelman Syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]