9. 下列關於職業性氣喘Occupational asthma (OA) 的敘述，何者錯誤？ (A) 職業性氣喘一般可分為OA with a latency period和irritant-induced asthma兩型 (B) OA with a latency period約佔85~90%，而irritant-induced asthma約佔10~15% (C) OA with a latency period症狀以咳嗽為主，irritant-induced asthma症狀以喘鳴wheezing為主 (D) OA with a latency period和irritant-induced asthma對inhaled steroid和bronchodilator的治療皆有療效