Drop-Down Lists: Can we fill 2 columns at the same time?

Is there a way to have a drop-down list fill two columns (actually, two adjacent cells) when a selection is made from the drop-down list? Maybe using an array in the source formula?

For instance, let's say I pick a doctor from the drop down list, I would like the doctor's practice to automatically fill the cell next it so that the two always go together correctly. In the lists example below, when I select Dr. Elmer in column A, then I want Internal Medecine Associates to go in column B.

MD Practice
Dr. Bartholomew Central Endocrine Specialists
Dr. Elmer Internal Medicine Associates
Dr. Stamford Cardiology Associates

In that adjacent cell you would use a Vlookup() formula

e.g.

=if(A1="","",Vlookup(A1,X1:Y100,2,FALSE))

where A1 contains the 1st drop down and X1:Y100 contains a table of Doctor names and corresponding practices.

The pair of double quotes is a null in Excel..

So the statement says... if A1 is null (blank), then return a null, otherwise perform the Vlookup..