How would this game play out: 1985 Chicago Bears vs. 1989 San Francisco 49ers?

The greatest defense that will ever play football vs. what many would consider the greatest offense. Do you consider these the two greatest teams to take the field? Would the Niners be able to do anything against that D? What would the final score be?
Update: They are the two greatest teams. Only other team that even challenges is the 72 Dolphins with their schedule against opponent's with a combined record of .396. lol
Update 2: LOL the Bears never lost 28 to 0 to anyone. You're a retard.
Update 3: LOL the Bears never lost 28 to 0 to anyone. You're a retard.
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