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
Nail patella syndrome is characterized by -a) Iliac hornb) Sacral hornc) Absent patellad) Knee deformitye) Dislocation of patella 
Select and explain. 
A. bce, B. bde, C. acde, D. abde
C: acde
Answer: C: acde 
Explanation: The disease is characterized by :-


Unduly small or absent patella
Nail dysplasia (nail dystrophy) most commonly in thumbnail
Recurrent dislocation of patella
Postero-lateral subluxation of radial head
Bony excrescences on lateral aspect of the ileum, i.e. iliac horns.
Genu valgum
Congenital nephropathy