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
In children persistent priapism may result due to 
Select and explain. 
A. Thrombosis of venous plexus, B. Leukaemia, C. Wilm's tumour, D. Trauma
B: Leukaemia
Answer: B: Leukaemia 
Explanation: None