This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Catastrophic variant of Ehler Danlos syndrome is \nSelect and explain. \nA. I, B. II, C. III, D. IV', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ehlers danlos syndrome comprise group of clinically and genetically heterogeneous group of disorder that result from defects in synthesis or structure of fibrillar collagen. Ref Robbin's 9th/146", 'role': 'assistant'}]