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: Medicine
[{'content': "Severe Laxity of joints - a) Marfan's syndrome   b) Ehler Danlos  c) RA  d) Osteogenesis imperfecta  e) OA \nSelect and explain. \nA. ab, B. abc, C. ade, D. ae", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]