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': 'Alpha feto protein is elevated in what percentage of children with hepatoblastoma: \nSelect and explain. \nA. 10%, B. 50%, C. 90%, D. 100%', 'role': 'user'}, {'content': "Answer: C \nExplanation: Most liver function test results are normal. Alpha-fetoprotein levels are increased in 90% of children with hepatoblastomas but are elevated much less commonly in children with other liver malignancies. Ref: Schwaz's principle of surgery 9th edition, chapter 39.", 'role': 'assistant'}]