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': "Yttrium 90 microspheres are used in treatment of: \nSelect and explain. \nA. Wilm's tumour, B. Teratoma, C. Hepatocellular carcinoma, D. All of the above", 'role': 'user'}, {'content': "Answer: C \nExplanation: Selective internal radioembolization is a promising new treatment modality for patients with inoperable primary or metastatic liver tumors. The treatment is a minimally invasive transcatheter therapy in which radioactive microspheres are infused into the hepatic aeries a transfemoral percutaneous approach. The yttrium 90 microspheres are directly injected into the hepatic aery branches that supply the tumor. Once infused, the microspheres deliver doses of high-energy, low-penetration radiation selectively to the tumor. The main indications are inoperable HCC118 and colorectal cancer hepatic metastases for which systemic chemotherapy has failed Ref: Schwaz's principle of surgery 9th edition, chapter 31.", 'role': 'assistant'}]