#6 provides the clue re MDs ...
http://www.walletpop.com/blog/2010/05/10/the-10-most-profitable-college-majors/?icid=sphere_copyright
6. Biochemistry. Graduates with this major can find work as lab technicians, analytical chemists, and researcher assistants. This major also opens the door to advanced or medical degrees.
Average starting salary: $41,700. Average mid-career salary: $94, 200.