This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Complications In  Orthopedics, Subject name: Orthopaedics
[{'content': '"Trident hand" seen in \nSelect and explain. \nA. achondroplasia, B. mucopolysaccharoidosis, C. diphyseal achlasia, D. cleido-cranial dystosis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans is 'a' i.e. achondroplasia Trident hand: The hands are short and broad. The central 3 digits being divergent and of almost equal length.More about Achondroplasia Inheritance - AD*It is caused by failure of normal ossification of bones, mainly the long bones* resulting in dwarfism.Dwarfism is disproportionate * since growth of the trunk is only marginally affected. US/LS is >1*Shortening is specially marked in the proximal segments* of the limbs.Intelligence is normal*There is marked lumbar lordosis which may occasionally lead to compression of the spinal cord.", 'role': 'assistant'}]