396MedicalMediumDissociative Sedation and analgesia described by Robert and Rosebaum in 1971 is________?A20 to 30% N20B5 to 20% N20C30 to 50% N20D50 to 70% N20 Correct answerD. 50 to 70% N20 ExplanationThe correct answer is 50 to 70% N20.