There are three tests every answer you give should pass: It should (1) inform, (2) persuade, and (3) tie in with your main purpose and objective. To be informed and persuaded is why your audience is present in the first place; the question-and-answer session is an extension and elaboration of your basic purpose. Make it work for you, and no matter how rough—or how pleasant—your reception is, always sincerely thank the audience for the time and effort they gave to the question-and-answer session and for the ideas they contributed.