premise: Since '82 Federal Chancellor (elected by "constructive vote of no confidence" against former Chancellor Helmut Schmidt, Social Democratic Party (SPD); reelected 1983, 1987, 1991 and 1994). This makes Helmut Kohl the longest-serving chancellor of the Federal Republic, passing by Konrad Adenauer, the first chancellor, this October.
hypothesis: Konrad Adenauer was the longest service Chancellor 
reason: Helmut Kohl was the longest-serving Chancellor passing Konrad Adenauer