If I have understood your query ( I can't find the actual Kwiz question), you can say both -
because of the 'très'
If it was the adjective intéressant/e on its own it would be after the noun.
C'est un homme intéressant
C'est une personne intéressante
Hope this helps!
I'm bumping this one up as I don't understand this part of the rule either - hopefully someone will be able to explain.
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