The CAG had given its report in November last year saying the government may have lost up to Rs. 1.76 lakh crore due to sale of spectrum in 2008 at 2001 prices.
"I am fully aware of my responsibilities, my obligations, my duties not only as a Minister but also as a citizen of this country," he said in response to PAC Chairman's letter to Lok Sabha Speaker Meira Kumar.
Sibal, meanwhile, welcomed Supreme Court's observation that no one should comment on CAG report. "I wish that Supreme Court had made this observations earlier as that could have prevented an unnecessary controversy."