Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:

All nieces are sisters.

Some nieces are brothers.

Conclusion:

I : Some brothers are sisters.

II : All sisters are nieces.

III : No brothers are sisters.

Only conclusion I follows