This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thigh, Knee,Leg,Foot & Ankle injuries, Subject name: Orthopaedics
[{'content': 'For a distended knee joint which of the following position is most comfoable? \nSelect and explain. \nA. Full extension, B. 30deg flexion, C. 60deg flexion, D. 90deg flexion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In 30deg flexion, knee joint has maximum capacity and pressure of contained fluid or blood is minimum and consequently, there is the least pain. The capacity of knee joint decreases and pain thereby increases when the knee is fully extended or flexed more than 30deg-45deg. Ref: Maheshwari 9TH ED pg 149.', 'role': 'assistant'}]