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 within what duration of surgery 
Select and explain. 
A. 6 hours, B. 12 hours, C. 24 hours, D. 48 hours
C: 24 hours
Answer: C: 24 hours 
Explanation: Ans. is 'c' i.e., 24 hours Hemorrhage in surgery* Primary haemorrhage is haemorrhage occurring immediately as a result of an injury (or surgery).* Reactionary haemorrhage is delayed haemorrhage (within 24 hours) and is usually caused by dislodgement of clot by resuscitation, normalisation of blood pres- sure and vasodilatation. Reactionary haemorrhage may also result from technical failure such as slippage of a ligature.* Secondary haemorrhage is caused by sloughing of the wall of a vessel. It usually occurs 7-14 days after injury and is precipitated by factors such as infection, pressure necrosis (such as from a drain) or malignancy.