Playing IMPs, you pick up this hand in fourth seat:
♠K Q J 9 ♥A 10 5 ♦K 3 ♣10 9 4 3.
Your left-hand opponent opens 1NT (15–17 HCP), partner passes, and RHO bids 3NT. Despite having an opening hand, you can’t really enter this auction, so you pass, as do LHO and partner.
The opening lead is the ♥3, and this is what you see:
Declarer plays the 9 from dummy. What card do you play and why?