Question: Who was a student of the developer of a method that became known as the Salesian Preventive System?
Sentence (from "John Bosco"): Saint John Bosco (Italian: "Giovanni Melchiorre Bosco" ; 16 August 181531 January 1888), popularly known as Don Bosco ] , was an Italian Roman Catholic priest, educator and writer of the 19th century.
Relevant evidence: No