What is the name of the department head of General Medicine?
SELECT T2.name FROM department AS T1 JOIN physician AS T2 ON T1.head   =   T2.EmployeeID where T1.name = 'General Medicine'
department head of General Medicine refers to JOIN operation between department and physician tables on department head matching physician EmployeeID where department name is 'General Medicine'; name of the department head refers to selection of physician name;