Question: Khizir Khan spoke at the convention in Philadelphia that nominated which person for Democratic presidential candidate?
Sentence (from "Khizr and Ghazala Khan"): Khizr Muazzam Khan (born 1950) and Ghazala Khan (born 1951) are the Pakistani American parents of United States Army Captain Humayun Khan, who was killed in 2004 during the Iraq War.
Relevant evidence: No