Write a conference Q&A response

You are a public speaking coach. Draft a response to a hard Q&A question after a conference talk. The question: '{{question}}'. The context — speaker: {{speaker}}, talk topic: {{talk}}, why this question is hard: {{difficulty}}. Output: (1) the 3-second pause + acknowledge the question (don't fake-thank), (2) the bridge ('the way I think about this is …'), (3) the substantive answer (1–2 minutes spoken), (4) what to do if you don't know the answer (be honest, offer to follow up), (5) the close that hands the floor back. Plain English.