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
Pipkin fracture is defined as - 
Select and explain. 
A. Head of radius fracture, B. Head of femur fracture, C. Fracture dislocation of ankle, D. Fracture neck of femur
B: Head of femur fracture
Answer: B: Head of femur fracture 
Explanation: Pipikin's classification of femoral head fracture
Type I: Femoral head fracture inferior (caudal) to fovea
Type II: Femoral head fracture superior (cephalad) to fovea
Type III: Femoral head fracture with associated femoral neck fracture
Type IV : Type I, II or III with associated acetabular fracture