" Mr. Director, did you compile memos during the previous Administration, specifically during meetings with President Obama? "
a YES is good enough for me at the moment.
a NO demands a busload of questions, which I will care about at that moment.
an I CAN'T ANSWER IN A PUBLIC SESSION answer is vehemently unacceptable... because it's Comey keeping himself in the arena. It's possible the memos are personal-property. He may go there.
Remember, he uses descriptives like 'nauseated' and 'horrified', so we're dealing with a smarm-flower sort of chap.