The senior parliamentary financial committee that examines the audit reports of the Comptroller and Auditor General and scrutinises how the Government has spent the money voted by Parliament.
The 22-member composition (15 plus 7), the no-Minister rule, the Opposition chairperson convention and the CAG link are standard parliamentary-oversight facts.
The PAC has 22 members, not 30 (that is the Estimates Committee, which is Lok Sabha only); it conducts post-mortem scrutiny after spending and reporting, not advance approval; its chairperson is from the Opposition.
22-member (15 LS plus 7 RS) parliamentary committee examining CAG reports, chaired by the Opposition, no Minister allowed.