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
Which of the following will cause post operative haemorrhage? 
Select and explain. 
A. Salicylates, B. Liver cirrhosis, C. Prolonged antibiotic administration, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None