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': 'Paternal 15 chromosome deletion is seen in \nSelect and explain. \nA. Angelman syndrome, B. Prader willi syndrome, C. Down syndrome, D. Tarner syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]