Index and Match functions

I am looking for a formula to look up and match data in 2 columns. Sheet1 contains the information. Sheet2 is where the inputs are made. In Sheet2 I want to match column A and B to the data in Sheet1 and have ColumnC in sheet2 to have the same output as the matched of columns A&B of the same row. Hopefully I have been clear enough in here and in the attachment. Thanks for your help.