8.有關眼用製劑常用防腐劑之使用濃度，下列何者錯誤？
(A)chlorhexidine acetate 0.01% w/v
(B)benzalkonium chloride 0.01% w/v
(C)phenylmercuric nitrate 0.02% w/v
(D)chlorobutanol 0.5% w/v