Statements: Some pianos are violins.
Some violins are drums.
All drums are guitars.
No guitar is a flute.
Conclusions: I. Some guitars are pianos.
II. Some drums are flutes.
III.Some pianos are drums.
IV. No flute is a drum.
1) None follows
2) Only I follows
3) Only either II or IV follows
4) Only IV follows
5) None of these

Explanation

4, Only IV follows