Question: What is the name of the department with the most students enrolled?
SQL: SELECT T4.dept_name FROM CLASS AS T1 JOIN enroll AS T2 ON T1.class_code  =  T2.class_code JOIN course AS T3 ON T1.crs_code  =  T3.crs_code JOIN department AS T4 ON T3.dept_code  =  T4.dept_code GROUP BY T3.dept_code ORDER BY count(*) DESC LIMIT 1