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
Patient giving history of thrombocytopenic purpura reports for extraction. What could be the most common postoperative complication? 
Select and explain. 
A. Oedema, B. Haemorrhage, C. Infection spreading through tissue spaces, D. Dry socket
B: Haemorrhage
Answer: B: Haemorrhage 
Explanation: None