This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
Reactionary hemorrhage occurs: 
Select and explain. 
A. After 24 hours, B. After 48 hours, C. Within 24 hours, D. After 7 days
C: Within 24 hours
Answer: C: Within 24 hours 
Explanation: Ans. (c) Within 24 hours(Ref Bailey 26/e p19-20)Types of hemorrhage after surgery:PrimaryReactionarySecondaryImmediately after surgeryWithin 24 hours7-14 dasImmediate injuryto vesselDislodgement of clot by resuscitation,Slippage of knotSloughing of blood vessel due to infection, pressure necrosis