You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is a step in case-control study? and explain in detail?
There are four basic steps in conducting a case control study:

Selection of cases and controls
Matching
Measurement of exposure, and
Analysis and interpretation

Reference: Essentials of Preventive and Community Dentisitry, Soben Peter , 4th ed page no 59