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': 'Investigation of choice for amoebic liver abscess: March 2012 \nSelect and explain. \nA. Demonstration of parasites in stool, B. Serum Entamoeba antibodies, C. Aspiration of cyst fluid, D. X-ray abdomen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B i.e. Serum Entamoeba antibodies Diagnosis of amoebic liver disease Analysis of serum for Entamoeba antibodies by immunoassay carries 99% sensitivity and more than 90% specificity, and is more accurate than stool analysis in amoebic liver disease Diagnosis may depend on cyst aspiration revealing the classic anchovy sauce appearance of the cyst fluid', 'role': 'assistant'}]