RFE issued today for both primary & dependent

[sp29201]

what would be the RFE if it is issued for both primary and dependent on the same day. Would it be for medical or birth certs? any guess?
thanks,
sp29201

Here are my details:
-----------------------------------------
EB2 Nebraska Service Center
PD 1/2001 (substitute labor)
I-140 ND Feb 18th 2003
I-140 Approved on May 1st
I-485 ND - 3/6/2003
1 st Finger Printing Done - April 22nd 2003
2 EAD's approved for Myself and Dependent
2ndFP:12/23/2004
RFE Sent 2/4/2005

 

[MydreamUSA.]

it also could be I-94 forms and a proof of status for certain periods.