69.日常所使用的牙科局部麻醉藥劑的標準藥品及濃度是：
(A)1% lidocaine，含1:50,000 epinephrine
(B)2% lidocaine，含1:100,000 epinephrine
(C)3% lidocaine，含1:200,000 epinephrine
(D)4% lidocaine，含1:50,000 epinephrine