nomis5 - 8:56 pm on Dec 13, 2012 (gmt 0)
If it was me I'd answer G now.
Say that out of xthousand posts this is the only one that has generated a DMCA. Say also you are not convinced as to who is the original author of the post content. Say you have deleted the post to avoid any confusion. Tell the truth and try and include your opinion that the originator of the DMCA is doing it maliciously. But do everything in an ultra-polite and helpful manner.