What legal case established the "insanity defense"?

Choice A reason: Durham v. U.S. introduced the concept that a defendant is not criminally responsible if their unlawful act was the product of a mental disease or defect, forming the basis for the modern insanity defense. Choice B reason: Rennie v. Klein addressed patients’ rights to refuse medication, not the insanity defense. Choice C reason: Dusky v. U.S. established the standard for competency to stand trial, not the insanity defense. Choice D reason: Tarasoff v. Regents of the University of California established the duty to warn potential victims, unrelated to the insanity defense.