Question: Antônio Carlos Silva, is a Brazilian mixed martial artist who formerly competed in the heavyweight division of the UFC, known for being one of the five men, along with Fabrício Werdum, a Brazilian mixed martial artist and former Heavyweight Champion, of which organization?
Sentence (from "Rafael Cavalcante"): He formerly competed in Strikeforce, where he was at one time Strikeforce Light Heavyweight Champion.
Relevant evidence: No