Can someone help with a formula to return a value from this lookup.

I have created an example of the lookup I need.
The target range is a range of (say) three columns. I want to lookup a
value from the third column and return the value from the first cell in
the corresponding row.

eg three columns (A, B, C)
4 rows (1,2,3,4)

Description Qty Code
Desc A 3 1
Desc B 4 2
Desc C 2 3
Desc D 8 4

if the target is "3" I want to return "Desc C"
if the target is "4" I want to return "Desc D"

Thanks