In the following question below are given some statements followed by some conclusions based on those statements. taking the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusion logically follows the given statements.

Statements:

I. All Z are Y.

II. Some Y are B. 

Conclusion:

I. Some B are not Z.

II. Some Y are not Z

III. Some Z are Y.

Only conclusion III follows 

The Venn diagram for the statements can be drawn as  - 

The Conclusion I i.e.Some B are not Z  is not conclusive from the figure