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': 'Nail patella syndrome is characterized by -a) Iliac hornb) Sacral hornc) Absent patellad) Knee deformitye) Dislocation of patella \nSelect and explain. \nA. bce, B. bde, C. acde, D. abde', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The disease is characterized by :-\n\n\nUnduly small or absent patella\nNail dysplasia (nail dystrophy) most commonly in thumbnail\nRecurrent dislocation of patella\nPostero-lateral subluxation of radial head\nBony excrescences on lateral aspect of the ileum, i.e. iliac horns.\nGenu valgum\nCongenital nephropathy', 'role': 'assistant'}]