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': "Patient having multiple odontogenic cysts, excessive length of bones, hyperexcitability of joints: \nSelect and explain. \nA. Ehlers danlos syndrome., B. Marfan syndrome., C. Down syndrome., D. Reiter's syndrome", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]