All-in After Check-Check When Blank Hits....Make the Call With 2-Pair?

[play2win]

PokerStars No-Limit Hold'em Tourney, Big Blind is t400 (8 handed) converter

MP1 (t23051)
MP2 (t30210)
Hero (t7165)
Button (t20085)
SB (t7330)
BB (t8709)
UTG (t44475)
UTG+1 (t6175)

Preflop: Hero is CO with A[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t1600</font>, <font color="#666666">1 fold</font>, SB calls t1400, <font color="#666666">1 fold</font>.

Flop: (t3175) K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Turn: (t3175) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t5705 (All-In)</font>

HERO......?