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: Microbiology
[{'content': 'The most sensitive test for H. pylori is - \nSelect and explain. \nA. breath test, B. Rapid urease test, C. Culture of biopsy, D. Microscopy of biopsy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]