Prepare for Tough Questions After a Presentation

Act as a presentation preparation coach. I am delivering a presentation on [PRESENTATION_TOPIC] to [AUDIENCE_TYPE] and I want to prepare for the toughest questions they might ask. Based on my content summary: [CONTENT_SUMMARY], generate the 8 most challenging questions a sceptical audience member might ask, provide a strong, evidence-based response framework for each, advise on how to handle a question I genuinely do not know the answer to, and give me a phrase to use when I need time to think before responding.