This was at a Philadelphia Unit Sectional held in Cherry Hill, NJ. LHO (West) was a well known visiting pro from the midwest, and RHO was his client. Other than the visiting pro, the opponents are not strong.
Here is the situation:
I led my singleton club. Declarer played an honor from dummy and partner won his A. Partner then played the ♠K, declarer playing small from hand.
(1) What card do you play at trick 2?
(2) Is your answer any different if you play UDCA?

Help

1♠ - (P) - 2♠* - (x)
P - (3♥) - All Pass
* - Bergen Raise - exactly 3 spades or 4333, 6-10 HCP