সঠিক উত্তর হচ্ছে: Prof. Morgenthau
ব্যাখ্যা: Professor Morgenthau\nBorn: Hans Joachim Morgenthau\nFebruary 17, 1904\nCoburg, Saxe-Coburg and Gotha, Germany\nDied: July 19, 1980 (aged 76)\nNew York\nNationality: German-American\nKnown for: Classical realism\nNotable work: Politics Among Nations.\n[Source: Stanford University Press]