Take the following as truth: He's neither immune to the professor's charm nor untroubled by what the professor says about the Northern  a culture war in which Yankees imposed their imperialist and capitalist will on the agrarian South, just as they had done to the Irish and Scots.
Then the following statement: "The professor was talking about the North and the South; it was a subject that he is passionate about." is true, false, or inconclusive?