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
Avascular necrosis is the commonest in one of the following fracture - 
Select and explain. 
A. Garden 1 and 2 fracture of femoral neck, B. Garden 3 and 4 fracture of femoral neck, C. Sub-trochanteric fracture of femoral neck, D. Baso-trochanteric fracture
B: Garden 3 and 4 fracture of femoral neck
Answer: B: Garden 3 and 4 fracture of femoral neck 
Explanation: AVN and non-union are almost always seen with displaced fracture (Garden's III & IV) and are less common with undisplaced fractures (Garden's I & II).