who was the chairman of pfc ludogorets razgrad and also 2015–16 pfc ludogorets razgrad season ?
SELECT DISTINCT var_uri where brack_open dbr_2015–16_PFC_Ludogorets_Razgrad_season dbo_chairman var_uri sep_dot dbr_PFC_Ludogorets_Razgrad dbo_chairman var_uri brack_close