This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
according NHS protocol time frame of surgery is ? 
Select and explain. 
A. sign out -sign in -time out, B. sign out-time out-sign in, C. sign in - time out- sign out, D. sign in -sign out-time out
C: sign in - time out- sign out
Answer: C: sign in - time out- sign out 
Explanation: ref : who.gov / schwaz text book general surgery