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: Pathology
Reactionary hemorrhage occur within: March 2010 
Select and explain. 
A. 24 hours, B. 1-2 days, C. 2-4 days, D. 4-6 days
A: 24 hours
Answer: A: 24 hours 
Explanation: Ans. A: 24 hoursAccording to the "time of appearence" hemorrhage can be classified in to:Primary hemorrhage - Is one which occur at the time of injury or operation.Reactionary hemorrhage - In majority of cases reactionary occur within 4 to 6 hours. Such bleeding may also occur due to:- Restlessness- Coughing- Vomiting with raises the venous pressure.Secondary hemorrhage -This occurs usually after 7 to 14 days of injury or operation. This is usually due to infection and sloughing of a pa of the aerial wall.