According to Robert and Rosebaum's 1971 description, what concentration range of nitrous oxide is used for dissociative sedation and analgesia?

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Nitrous oxide at 5 to 20%Nitrous oxide between 20 and 30%Nitrous oxide ranging from 30 to 50%Nitrous oxide from 50 to 70%Nitrous oxide above 70%

Explanation

Robert and Rosebaum defined dissociative sedation and analgesia as involving nitrous oxide concentrations between 50 and 70%. Lower concentrations such as 5-20%, 20-30%, or 30-50% do not achieve the dissociative effect described.