In the following question below are given three statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements, disregarding commonly known facts.

Statements : 

Some stones are not rods. 

All rods are black. 

No black is a crow. 

Conclusions : 

I. Some crows are rods. 

II Some blacks are stones. 

III. Some crows are blacks. 

IV. Some stones are rods,