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
60 year old women suffers a fall, lower limb is extended and externally rotated likely diagnosis 
Select and explain. 
A. Acetabular fracture, B. Posterior dislocation of Hip, C. Fracture neck femur, D. Fracture shaft of femur
C: Fracture neck femur
Answer: C: Fracture neck femur 
Explanation: None