♠AKxx ♥KJxx ♦x ♣xxxx
Dealer (your LHO) opens 1♣, partner doubles, and Responder (your RHO) bids 1♦. Your agreement is for a double here to be for the majors, for good or ill, but that makes life easy for you. So, you double.
Opener bids 1NT, and your partner passes. Responder-RHO jumps to 3♦. With extras, but a partner who is occasionally light for his takeout if shapely and who might have 3-3 in the majors even, you double. Whether this is right or not, this is what happened, so deal with it!
Anyway, Opener now bids 4♦ and partner pops in a 4♥, finally helping you out.
RHO now bids 5♦, which you of course hit. This runs around to Responder, who sends it back, all pass. A tad worried?
So, what is your lead?
After your lead, what is your play (or expected play) to trick #2 when you see this dummy (hidden):

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