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': 'The most common physical sign of cerebral metastasis- \nSelect and explain. \nA. Epilepsy, B. Focal neurological deficit, C. Papilloedema, D. Visual defects', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]