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
Triple deformity of knee includes following except? 
Select and explain. 
A. Flexion of knee, B. External rotation of tibia, C. Posterior subluxation of tibia, D. Extension of knee
D: Extension of knee
Answer: D: Extension of knee 
Explanation: Ans. is 'd' i.e., Extension of knee Triple deformity of knee refers to : - Flexion of knee External rotation of tibia Posterior subluxation of tibia Triple deformity is seen in RA, TB of knee and Polio.