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
A patient with hip in adduction and medial rotation and is unable to move probable diagnosis is - 
Select and explain. 
A. Posterior dislocation head of femur, B. Fracture shaft of femur, C. Fracture neck of femur, D. Sciatica
A: Posterior dislocation head of femur
Answer: A: Posterior dislocation head of femur 
Explanation: None