I want to know the answer to the following question:
Besides Qiantang and Jiankang, what was the other major metropolitan center in the south?
All the background I'm provided with is that "Despite the continuing prominence of Nanjing (then known as Jiankang), the settlement of Qiantang, the former name of Hangzhou, remained one of the three major metropolitan centers in the south to provide major tax revenue to the imperial centers in the north China.". Is that enough to answer the question?