get the max date from table

hi

i have below data in my table.

instance   entrydate   program              code

1              02/22/2013            50            df

2             03/03/2014            4              gf

3             12/13/2014             50            rd

what i need is i need to pick the latest instance of program 50 and i need to use that code to join another table.

how to do that, can i use max date , then i need to do group by and then its getting max date by every program.

i dotn want that, i just need latest record of program 50 , just 1 row and its associated code

please help me