Answering Discovery Questions about the Original & First Amended Complaint

I am a pro se Plaintiff in a case and served a court ordered 2nd Amend Complaint on defendants. In discovery, the defense is asking questions about the Original and 1st Amended Complaint. I objected. Am I obligated to answer any discovery questions about these previous complaints, as the 2nd Amended Complaint is now the "operative complaint"? In a letter, they said, "... that objection is not valid because the definitions clearly state that use of the word "Complaint" is intended to refer to, among other things, the second amended complaint on file with the Court." They are clearly asking questions about counts in the previous complaints that are NOT in the 2nd Amended Complaint. Am I obligated to answer them? Thank you.