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select the best research design to use in this study

Given that the description of the case below, identify whether you would use  a randomized block design, a completely randomized design or a matched pairs design.

Lisinipril drug study:  Lisinipril is a drug designed to lower blood pressure. In a clinical trial of
Lisinipril, blood pressure levels of subjects are measured before and after they have been
treated with the drug.