The correct answer is clinical or case study.
A case study is a type of research methodology that produces a thorough, multifaceted understanding of a complex problem in its actual setting. It is a well-known research strategy that is widely applied in a range of fields, especially the social sciences. Numerous definitions of a case study exist, but they all include the requirement to thoroughly examine an event or phenomena in its original setting. In contrast to an "experimental" design (like a randomized controlled trial), which aims to exercise control over and modify the variable(s) of interest, it is for this reason that it is sometimes referred to as a "naturalistic" design.
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