Rephrasing the question Redirecting the question to the audience/class Admitting your ignorance Finding a solution
Redirecting the question to the audience/class and rephrasing the question give impressions of you dodging the questions as well. The best idea I can see is be honest that you don’t know the answer, and then initiate a discussion with audience, or/and find a solution later. How to Handle Tough Questions from an Audience – [Mother Tongue Annoyances]