which silver medalist of the athletics at the 2016 summer olympics – men's 400 metres was also the flagbearer of the grenada at the 2016 summer olympics
SELECT DISTINCT var_uri where brack_open dbr_Athletics_at_the_2016_Summer_Olympics_–_Men's_400_metres dbo_silverMedalist var_uri sep_dot dbr_Grenada_at_the_2016_Summer_Olympics dbp_flagbearer var_uri brack_close