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: Radiology
[{'content': 'All of the following modalities can be used for in-situ ablation of liver secondaries, except – \nSelect and explain. \nA. Ultrasonic waves, B. Cryotherapy, C. Alcohol, D. Radio frequency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Treatment modalities for liver secondaries \n\nLiver transplant (in patients with single lesion < 5 cm or three or fewer, lesions < 3 cm)\nHepatic artery embolization & chemotherapy (chemoembolization)\nIntralesional in situ ablation via ultrasound-guided\n\n\xa0 \xa0 \xa0 \xa0 \xa0Percutaneous ethanol (alcohol) injection\n\xa0 \xa0 \xa0 \xa0 \xa0Cryotherapy\n\xa0 \xa0 \xa0 \xa0 \xa0Radiofrequency ablation\n\xa0 \xa0 \xa0 \xa0 \xa0Microwave coagulation therapy', 'role': 'assistant'}]