*either natural ♠ or 4th suit forcing
** 4 cards ♠
*** GF, Natural ♦ (= 1♠ was 4th suit)
You led the ♣3. Declarer played low from dummy, partner followed with the ♣8 and declarer won it with the ♣J. He then played the ♦Q, on which you played low (partner played the ♦9, for standard count). Declarer continued with a Club to the ♣A (Partner played the ♣9), and with the ♦K, discarding a Club from hand. You won the ♦A.
Which card do you play now?