Three statements are given followed by four conclusions I, II, III and IV. You have to consider these statements to be true, even if they seem at variance from commonly known facts. Decide which of the given conclusions logically follow/s from the given statement.

Statements:

I. All parrots are crows.

II. All crows are robins.

III. All robins are swan.

Conclusions:

I. All parrots are swans.

II. All swans are crows.

III. All robins are parrots.

IV. All crows are swans.

Only conclusions I and IV follow.