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': "The following are the features of Marfan's syndrome except - \nSelect and explain. \nA. Arachnodactyly, B. Reduced joint mobility, C. Dislocation of the lens, D. Mitral regurgitation", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Reduced joint mobility There is hypermobility at joints.", 'role': 'assistant'}]