Three statements are given, followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.

Statements:
All classrooms are schools.
No school is a park.
All houses are parks.

Conclusions:
I. No house is a classroom.
II.No park is a classroom.
III. No school is a house.