SELECT T2.firstname ,  T2.lastname FROM list AS T1 JOIN teachers AS T2 ON T1.classroom  =  T2.classroom GROUP BY T2.firstname ,  T2.lastname ORDER BY count(*) DESC LIMIT 1
Which teacher teaches the most students? Give me the first name and last name of the teacher.
[Schema (values) (types)]: | student_1 |  list : lastname (text) , firstname (text) , grade (text) , classroom (number) | teachers : lastname (text) , firstname (text) , classroom (text);