Question: what was the nationality of a boxer who was managed by Cedric Kushner and born in 7 January 1966?
Sentence (from "Five O'Clock World"): It reached number 1 on WLS on 17 December 1965 and 7 January 1966, number 1 in Canada on the "RPM" singles chart on 10 January 1966 (their first of two chart-toppers there that year, followed by "Magic Town" in April), and number 4 in the U.S. on the Hot 100 on 15–22 January 1966 and is one of The Vogues' best-known hits, along with "You're The One".
Relevant evidence: No