SSC CPO 12 Mar 2019 Shift 2 Paper

Two 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:
Some rivers are brooks.
No brook is a stream.
Conclusions:
I. No stream is a brook.
II. Some streams are rivers.
III. Some brooks are rivers.