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: Pathology
[{'content': 'Thorium dioxide causes - \nSelect and explain. \nA. Lymphoma, B. Lymphangiosarcoma, C. Angiosarcoma, D. Hemangioendothelioma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hepatic angiosarcomas are associated with carcinogen exposures, including arsenic, thoracotrast and polyvinyl chloride.', 'role': 'assistant'}]