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': 'A patient presents with complains of sciatica. On radioligical examination there was sclerotic lesions on his skull. Which of the following is most likely to be elevated in this patient ? \nSelect and explain. \nA. CEA, B. Prostate specific antigen, C. Alkaline phosphatase, D. Alpha 1 antitrypsin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Prostate specific antigen", 'role': 'assistant'}]