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
[{'content': 'Materials used for therapeutic embolisation are all except \nSelect and explain. \nA. Blood clot, B. Ethyl alcohol, C. Wool, D. Omentum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Omentum is not a material used for therapeutic embolisation.', 'role': 'assistant'}]