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: Anatomy
[{'content': 'Risk factor for angiosarcoma of liver \nSelect and explain. \nA. OCP, B. Phenacetin, C. Vinyl chloride, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Angiosarcoma of the liver, a rare fatal tumor, has been seen in workers intensively exposed to the gas vinyl chloride monomer (VCM) for prolonged periods while working in polyvinyl chloride (PVC) polymerization plants. It has also been associated with individuals exposed to arsenic-containing insecticides and Thorotrast', 'role': 'assistant'}]