Question: When was the African American mayor, who defeated by Rudolph Giuliani in 1993, born?
Sentence (from "New York City mayoral election, 1993"): The New York City mayoral election of 1993 occurred on Tuesday, November 2, 1993, with Republican nominee U.S. Attorney for the Southern District of New York Rudolph Giuliani narrowly defeating incumbent Democratic mayor David Dinkins.
Relevant evidence: Yes