DIRECTIONS : In question below are given two statements followed by two conclusion numbered I and II. You have to take the two given statements to be true even if they seem to be at variance with the commonly known facts and then decide which of the given conclusions logically follows from the two given statements, disregarding commonly known facts. 

Statements : 

All rivers are mountains 

Some rivers are deserts 

Conclusions : 

I. Some mountains are deserts 

II. Some deserts are not mountains