According to the psychodynamic perspective on personality, if a patient unconsciously attributes their own unacceptable thoughts or feelings to someone else, which defense mechanism are they most likely using?

Recall the definitions of the defense mechanisms listed: Rationalization involves justifying behaviors or feelings with logical reasons; Sublimation redirects unacceptable impulses into socially acceptable activities; Repression pushes distressing thoughts into the unconscious.

Recognize that Projection specifically involves attributing one's own unacceptable thoughts or feelings to another person, which matches the description in the problem.