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
Embolectomy should be done within 
Select and explain. 
A. 4 hours, B. 6 hours, C. 8 hours, D. 10 hours
B: 6 hours
Answer: B: 6 hours 
Explanation: Embolectomy should be done within 6 hours as after 6 hours, irreverside changes occur.