sillyfool Junior | Next Rank: 30 Posts View User Profile Posts: 20 Joined: Fri Nov 21, 2008 2:18 am GMAT Score:730 IMO A by sillyfool » Thu Nov 27, 2008 8:18 am choices with special can be eliminated as it is as they sound awkward and between A and B and C B is awkward as it is not clear whi is modifying the respiratory system. C is wordy but still not as good as A So A is the answer according to me Whats the OA? Top Quote