This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Medicine
[{'content': 'Test for confirming H.pylori eradication is \nSelect and explain. \nA. Urea breath test, B. Serology, C. Urine antigen test, D. Endoscopy biopsy test', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The test of choice for documenting of H. pylori eradication is the laboratory-based validated monoclonal stool antigen test or a urea breath test (UBT).The patient must be off antisecretory agents when being tested for the eradication of H. pylori with UBT or stool antigen. Serologic testing is not useful for the purpose of documenting eradication because antibody titers fall slowly and often do not become undetectable.Ref: Harrison; 19th edition; Page no: 1924', 'role': 'assistant'}]