Have you considered using a database and static questions and answers? This technique gets 100% perfect results each time and needs less energy.
I'm not sure how much energy Trivai requires, or if it's even remotely comparable, but you might be happy to know that all generated questions are stored in a database.
I would guess that humans produce "perfect" results 95+% of the time. In my own tests, Trivai gets "good" results, ~90% of the time.