What was the 'thought' process that led to Watson on Jeopardy to say Toronto and not Chicago as final answer?

Computer was supposedly brilliant most of game, but that was a really easy answer/question. (Topic is U.S. Cities, and answer was something like largest airport is named after WWII hero, and second largest after main WWII battle)What was the 'thought' process that led to Watson on Jeopardy to say Toronto and not Chicago as final answer?
I'm guessing the problem with that *particular* question was that Watson



a) did not have the origin of the names of the Chicago airports in its database

b) did not consider the Jeopardy! category to be sufficiently important when choosing an answer



In fact, excepting Toronto being in Canada, that solution satisfied the details in the clue.



- Jim, http://www.JeopardySolutions.com/What was the 'thought' process that led to Watson on Jeopardy to say Toronto and not Chicago as final answer?
Without being one of the programmers, we can do naught but guess at the process. However, the computer made many errors besides the one you mention. Jeopardy clues are often very complex, and rely upon puns, wordplay, and other language/cultural associations that seem very simple to our human minds, but can be very problematic for a computer program forced to rely strictly on digital logic algorithms. Watson won the competition, yes, but its advantage in buzzer reflex was as much to thank for that as was its 15-TB memory cache. A significant step in programming indeed, but nowhere near perfection.