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': 'Burr cell is seen in - \nSelect and explain. \nA. Uremia, B. Hepatocellular carcinoma, C. Gastric carcinoma, D. Ovarian carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]