Mark's editorial comment, "They knew he spoke this against them. . .", tells us how obvious and how stinging this story was to the original listeners.
Jesus saw the real issues behind their questions. I think the "render unto Caesar" answer is the best answer to any question ever!
Interesting the Sadducees asked a question about something they didn't believe in. They were deceived because they did not know the power of God or the Scriptures. How many people today are easily deceived for the same reasons?