This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pathology
[{'content': 'Thorium dioxide causes \nSelect and explain. \nA. Lymphoma, B. Lymphanfiosarcoma, C. Angiosarcoma, D. Hemangioendothelioma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Angiosarcoma of liver is a aggresive neoplasm associated with exposure to vinyl chloride ,arsenic or thorotrast GENERAL AND SYSTEMIC PATHOLOGY RAMDAS NAYAK PGNO.464 IMAGE REF:', 'role': 'assistant'}]