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
In which one of the following femoral fractures is Avascular necrosis common? 
Select and explain. 
A. Perochanteric, B. Transcervical, C. Sub-Trochanteric, D. Shaft of femur
B: Transcervical
Answer: B: Transcervical 
Explanation: B i.e. Trans cervical