Took this Medical Specialty Aptitude Test from the University of Virginia website just for fun. Ploughed through 130 questions (some of them were repeats) and arrived with this awful list. The top 10 ranks:

Rank Specialty Score
1 psychiatry 40
2 dermatology 40
3 pathology 39
4 nuclear med 37
5 neurology 37
6 occupational med36
7 plastic surgery 36
8 anesthesiology 36
9 radiology 36
10 gastroenterology36

Not quite sure if these are for real or not. They look awful to me. Maybe certain key questions swung the results a lot.