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
Materials used for therapeutic embolisation are all except 
Select and explain. 
A. Blood clot, B. Ethyl alcohol, C. Wool, D. Omentum
D: Omentum
Answer: D: Omentum 
Explanation: Omentum is not a material used for therapeutic embolisation.