instruction: What is the name of department where has the largest number of professors with a Ph.D. degree?
response: SELECT T2.dept_name, T1.dept_code FROM professor AS T1 JOIN department AS T2 ON T1.dept_code = T2.dept_code WHERE T1.prof_high_degree = 'Ph.D.' GROUP BY T1.dept_code ORDER BY COUNT(*) DESC LIMIT 1