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
Early movement for surgery following ankylosis is 
Select and explain. 
A. Harmful, B. Desirable, C. Unimportant, D. Indicated only when ankylosis is one sided
B: Desirable
Answer: B: Desirable 
Explanation: None