This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'The gold standard for diagnosing acid reflux is \nSelect and explain. \nA. Endoscopy, B. 24-hour pH monitoring, C. Manometry, D. Esophagogram', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The gold standard for diagnosing and quantifying acid reflux is the 24-hour pH test.Sabiston 20th edition Pg: 1070', 'role': 'assistant'}]