In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.
Statement I: No steam are vapours
Statement II: All smoke are steam
Conclusion I: Some vapours are smoke
Conclusion II: No smoke are vapours

Options

A. Only conclusion I follows
B. Only conclusion II follows
C. Both conclusions I and II follow
D. Neither conclusion I nor conclusion II follows

Answer

B