Getting the maximum value from dictionary

Question

I'm facing problem with this. I have 10,000 rows in my dictionary and this is one of the rows

Example: A (8) C (4) G (48419) T (2) when printed out

I'd like to get 'G' as an answer, since it has the highest value.

I'm currently using Python 2.4 and I have no idea how to solve this as I'm quite new in Python.

Thanks a lot for any help given :)