Under the Common Rule, which statement is NOT a required component of IRB composition?

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Diversification and independence guide IRB composition under the Common Rule. The board must have at least five members with varying backgrounds, including at least one member whose primary concerns are scientific, at least one whose primary concerns are nonscientific, and at least one member who is not affiliated with the institution. This setup ensures expert scientific review, ethical and community perspectives, and outside independence in oversight. Because these elements are required, each of the listed statements reflects a necessary component of an IRB. The option describing a member whose area of expertise is not scientific is, in fact, a required part of the board, not something that is not required. If a test item claims otherwise, it conflicts with the regulation. In practice, always ensure an IRB has 5+ members including a non-affiliated member, at least one scientist, and at least one nonscientist.