33 with str8 flush draw on flop

[dray]

3rd level of FTOPS Main Event Satellite. No real info on these guys, sorry.

Full Tilt Poker, NL Hold'em Tournament, 25/50 Blinds, 9 Players
LeggoPoker Hand History Converter

UTG+2: 1,350
MP1: 1,550
Hero (MP2): 1,950
CO: 1,510
BTN: 4,125
SB: 1,930
BB: 1,895
UTG: 4,890
UTG+1: 1,205

Pre-Flop: (75) 3[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] dealt to Hero (MP2)
UTG calls 50, 3 folds, Hero calls 50, CO folds, BTN calls 50, SB calls 25, BB checks

Flop: (250) 2[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] (5 Players)
SB checks, BB checks, UTG checks, Hero checks, BTN checks

Turn: (250) 5[img]/images/graemlins/heart.gif[/img] (5 Players)
SB checks, <font color="red">BB bets 50</font>, <font color="red">UTG raises to 100</font>

What now?