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: Surgery
Spur sign is/are seen in: 
Select and explain. 
A. Supracondylar fracture of humerus, B. Radial head fracture, C. Acetabulum fracture of pelvis, D. Talus fracture
C: Acetabulum fracture of pelvis
Answer: C: Acetabulum fracture of pelvis 
Explanation: Ans. (c) Acetabulum fracture of pelvisSpur cells-They are irregularly distoed red cells containing several irregularly distributed thorn like projections.Cells with this morphologic abnormality are also called acanthocytes.They are seen in Splenectomised patients and patients with liver disease.