Killer bee,the eight-tail ox/B and Yondaime Raikage/A
A is the son of the Third Raikage. At some point in the past, a group of young children were gathered in order to determine who would be A's tag-partner in keeping with a long-standing Kumogakure tradition of the Raikage having a tag-team partner. Only one child was able to successfully match A's power and use the Double Lariat on a training dummy.