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: Dental
[{'content': 'Which of the following is a step in case-control study? \nSelect and explain. \nA. Selection, B. Matching, C. Analysis, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: There are four basic steps in conducting a case control study:\n\nSelection of cases and controls\nMatching\nMeasurement of exposure, and\nAnalysis and interpretation\n\nReference: Essentials of Preventive and Community Dentisitry, Soben Peter , 4th ed page no 59', 'role': 'assistant'}]