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: Medicine
[{'content': 'Arsenic causes \nSelect and explain. \nA. Portal hypertension, B. Cirrhosis, C. Extra hepatic portal vein obstruction, D. Hepatic carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]