Pay people $1 and hour and ask them to choose A or B, which is more short and professional:

A) Keeping it short and professional. Yes, there are only seven deadly sins

B) Yes, there are only seven deadly sins

Also have all the workers know they are being evaluated against each other and if they diverge from the majority choice their reliability score may go down and they may get fired. You end up with some evaluations answered as a Keynesian beauty contest/family feud survey says style guess instead of their true evaluation.