Dianna was taken aback by the Professor's question. The fact that he was saying Slytherin's are prone to being evil because of the influence over Dark Magic or other words that associate with being evil. Although she wasn't saying it was a lie either. Not that she was one of those, of course NOT.

"Just like what my other classmate was saying, not all Slytherin's are prone to Dark Magic and all that evil stuff. Although for me, I think it all started with the fact that Salazar Slytherin's house was only for pure bloods, with exception to some other Dark wizards, and that he himself built the reputation of Slytherin's being... a bit... um...wait, let me rephrase that. Because Slytherins used to think highly of themselves and only themselves, loving the Dark Arts only, and sometimes being quite snobbish to others... ," Di said.
"But that was before... Honestly, in my opinion, all the houses at Hogwarts is cool to me.." she added with a smile.