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': 'Test used for presence of residual helicobacter pylori infection \nSelect and explain. \nA. Urease breath test, B. Rapid urease test, C. Gastric biopsy, D. Serological markers', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Urease breath test is used for both diagnosis and eradication.', 'role': 'assistant'}]