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: Orthopaedics
[{'content': 'Pseudoarthrosis is seen in all of the following except- \nSelect and explain. \nA. Idiopathic, B. Fracture, C. Osteomyelitis, D. Neurofibromatosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Congenital Pseudarthrosis\n\nPseudarthrosis, as the name suggests, is false joint, i.e. there is abnormal mobility between the two fragments of a bone.\nPseudarthrosis may be :\n\n\nAcquired :- When a fractured bone fails to unite, i.e. in nonunion (has been explained in earlier chapters).\nCongenital :- There is dysplasia of bone and soft tissue of a limb with failure of normal bone formation. Congenital Pseudarthrosis may be :-\n\n\nIdiopathic\xa0\xa0\nNeurofibromatosis type I (most common cause)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nFibrous dysplasia \xa0\xa0\nAmniotic constriction band\nOsteogenesis imperfecta\nCleidocranial dysplasia\nAS (infused bumboo spine)', 'role': 'assistant'}]