Reply to "Adjective categories"

Thanks for the reply, Gustavo.  Can I ask you another question? 

This is the transcript of a short conversation and I don't understand her answer:

(Man): Dr. Brighton’s Biology quizzes are short and tricky.

(Woman): Aren’t they, though? 

Maybe I do, but I cannot explain it; considering "if you understand it, you can explain it" then I don't understand it fully. What troubles me is the "though" part. I think the "aren't they" is an agreement of the statement he made and I just can connect the two parts. 

Thank you.

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