—Excuse me, can you tell me where the nearest bank is?

—_______ oh, yes! It's past the post office, next to a big market.[ ]

A.I beg your pardon?      

B. You asked the right question.

C. Mm, let me see          

D. Be quiet!

唯一能够从母体通过胎盘转运到胎儿体内的免疫球蛋白是______。