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: Surgery
[{'content': 'Survival in unresectable GB ca is? \nSelect and explain. \nA. 4-6 months, B. 8-10 months, C. 1 yr, D. 12-24 months', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]