Question: "Fat Man and Little Boy" is the fifth episode of which sixteenth season that began on Sunday, November 7, 2004 and contained 21 episodes, beginning with Treehouse of Horror XV? 
Sentence (from "Fat Man"): It was built by scientists and engineers at Los Alamos Laboratory using plutonium from the Hanford Site and dropped from the Boeing B-29 Superfortress "Bockscar".
Relevant evidence: No