A simple and effective structure for answering any question is: repeat or briefly rephrase the question (confirms understanding and ensures the whole room heard it), answer directly in one or two sentences, then stop -- many speakers lose credibility by rambling past a clear answer into unrelated territory. When asked something you genuinely don't know, the most credible response is to say so plainly and offer a concrete next step ('I don't have that figure with me, but I'll follow up by email this week'), since guessing or bluffing and being wrong damages trust far more than an honest 'I don't know' does. For a hostile or aggressive question, the most effective technique is to stay calm, acknowledge the underlying concern without agreeing to a false premise, and redirect to facts ('I understand the concern about cost -- here's how we're addressing that'), rather than becoming defensive or dismissive, which tends to escalate the room against the speaker rather than the questioner. Setting a time limit for Q&A in advance ('we have time for three questions') also helps a speaker end the session on their own terms rather than losing control of the room's energy.