which silver medalist of the athletics at the 1996 summer olympics – men's 800 metres was also the flagbearer of the south africa at the 2000 summer olympics
SELECT DISTINCT var_uri where brack_open dbr_Athletics_at_the_1996_Summer_Olympics_–_Men's_800_metres dbo_silverMedalist var_uri sep_dot dbr_South_Africa_at_the_2000_Summer_Olympics dbp_flagbearer var_uri brack_close