Question: Khizir Khan spoke at the convention in Philadelphia that nominated which person for Democratic presidential candidate?
Sentence (from "2016 Democratic National Convention"): Former U.S. Secretary of State, Hillary Clinton, was chosen as the party's nominee for president by a 59.67% majority of delegates present at the convention roll call, defeating primary rival Senator Bernie Sanders, who received 39.16% of votes from delegates, and becoming the first female candidate to be formally nominated for presidential by a major political party in the United States.
Relevant evidence: Yes