Three allins in front of me, do I fold this flop?

[Janabis]

Normally I'd love this flop, but the allins in front of me suggest that I'm probably behind a set. Does the big pot make it a must-call?

Party Poker No-Limit Hold'em, $25 (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($14.90)
UTG ($64.75)
Hero ($29.85)
CO ($3.88)
Button ($72.70)
SB ($26.20)

Preflop: Hero is MP with K, K. CO posts a blind of $0.35. SB posts a blind of $0.10.
1 fold, Hero raises to $1, CO (poster) calls $0.75, Button calls $1, SB (poster) calls $0.90, 1 fold.

Flop: ($4.35) 9, 7, 5 (4 players)
SB bets $2, Hero raises to $5, CO calls $2.78 (All-In), Button raises to $29, SB calls $23.20 (All-In), Hero calls $23.85 (All-In).

[ICantCash]

I think this is a fold, painfully. You are most likely behind one of the 3 all ins. I think someone would have to have a set or two pair here.