How to suss out whether job applicant might be sexist?

[Soleta]

10. Who is the best candidate?

Is it someone that can pass an obvious test in an interview with a simple answer, or someone who seems pensive when asked a genuinely complex question?

Simple minded people are less likely to treat everyone with respect, but they can learn to avoid the obvious traps. Smart people often don't see the traps for what they are, and will answer your questions in good faith. You will find the latter group's behavior suspicious.