Find the name of the teacher who teaches the largest number of students.
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
What is their class room?
select t1.classroom 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