The strongest answer begins with the question that was actually asked.

You feel a strong pull toward answering the question you prepared for, the one you find interesting, or the one you can answer well. The person asking notices immediately, and everything after that is heard as evasion, however good the material is. Addressing the real question first buys you the room to say the rest.

The next time you are asked something, restate it in your own words before you reply. Answer that plainly, including where the honest answer is that you do not know, and then add what you wanted to say.