This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
The following are the features of Marfan's syndrome except 
Select and explain. 
A. Arachnodactyly, B. Reduced joint mobility, C. Dislocation of the lens, D. Aoic dissection
B: Reduced joint mobility
Answer: B: Reduced joint mobility 
Explanation: Clinical features Slender, elongated habitus Abnormally long legs, arms, and fingers (arachnodactyly); High-arched palate Hyperextensibility of joints. Severe kyphoscoliosis, Pectus excavatum (i.e., deeply depressed sternum) or a pigeon-breast deformity. Dislocation, or subluxation, of the lens (ectopia lentis). Aneurysmal dilation and aoic dissection (Robbins Basic Pathology, 9 th edition. page : 221)