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
Deformity of posterior dislocation of hip 
Select and explain. 
A. Flexion, adduction, Internal rotation, B. Flexion, abduction, external rotation, C. Extension abduction, Internal rotation, D. Extension adduction, external rotation
A: Flexion, adduction, Internal rotation
Answer: A: Flexion, adduction, Internal rotation 
Explanation: A i.e. Flexion, adduction, intenal rotation