Hand #1001
North is the dealer, NS Vul, IMP's. You're playing Standard American - Not 2/1. You are South holding:
A743 
32 
KQ10 
KQJ10
| West | North | East | South |
|---|---|---|---|
| 1 |
Pass | 1 |
|
| Pass | 2 |
Pass | 3* |
| Pass | 3NT | Pass | Pass |
| Dbl | Pass | Pass | ? |
*3C=Artificial, 4th Suit Game Forcing
The double would tend to suggest spade lead (dummy's suit)
Incidentally, I actually prefer an immediate 2C response to 1H, but this is how the problem was presented.