Question: Which Sunni-Islamic fundamentalist organization has a social service wing named Dawah and had its politburo chief step down at the end of his term in 2017?
Sentence (from "Khaled Mashal"): Khaled Mashal (Arabic: خالد مشعل‎ ‎ "Khālid Mashʿal ", ] , born 28 May 1956) is a Palestinian political leader and the leader of the Islamic Palestinian organization Hamas since the Israeli assassination of Abdel Aziz al-Rantisi in 2004.
Relevant evidence: No