Question: In what ocean is the island in which were found subfossil remains of the Henderson ground dove? 
Sentence (from "Pitcairn Islands"): The Pitcairn Islands ( ; Pitkern: "Pitkern Ailen "), officially Pitcairn, Henderson, Ducie and Oeno Islands, are a group of four volcanic islands in the southern Pacific Ocean that form the last British Overseas Territory in the Pacific.
Relevant evidence: Yes