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': 'CTEV is caused by all except - \nSelect and explain. \nA. Neurological disorder, B. Idiopathic, C. Spina fibida, D. Cubitus varus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Causes of CTEV\n\nCTEV may be either primary or secondary\n\n1) Primary or Idiopathic\n\nIt is the most common type of CTEV\nFoot deformity (CTEV) is the only manifestation, otherwise, musculoskeletal system is normal.\n\n2)\xa0Secondary\n\nCTEV is a local manifestation of a systemic syndrome.\nCauses are:-\n\n\nNeurological disorders & neural tube defects eg myelomeningocele, & spinal dysraphism\nParalytic disorder (due to muscular imbalance) as polio, spina bifida, myelodysplasia, & Friedreich's ataxia\nArthrogryposis multiplex\nLarsen syndrome\nFreeman- Sheldon syndrome\nDiastrophic dwarfism\nSacral agenesis, tibial deficiency, constriction rings & amniotic bands", 'role': 'assistant'}]