42. 近年來文獻提出氣喘的死亡率已大幅降低,下列何者可能是降低氣喘死亡率最主要的
因素?
(A) short- acting inhaled β 2 - adrenergic agonist做為氣喘急救用藥
(B) 併用short- acting inhaled β 2 - adrenergic agonist以及short- acting inhaled muscarine
antagonist做為氣喘急救用藥
(C) inhaled corticosteroid
(D) systemic corticosteroid