• There are five houses in five different colors standing on a row from left to right. 
• One person lives in each house. 
• These persons all have different nationalities, drink a certain type of beverage, smoke a certain brand of cigarette and keeps a certain species of animal as pet.
• No person drink the same type of beverage, smoke the same brand of cigarette or keep the same species of animal as pet.

The question is: Who keeps the fish? The following clues will help you find the answer.

1. The Brit lives in the red house.
2. The Swede keeps a dog.
3. The Dane drinks tea.
4. The green house is on the left side of the white house.
5. The person in the green house drinks coffee.
6. The person who smokes Pall Mall keeps a bird.
7. The person in the yellow house smokes Dunhill.
8. The person in the center house drinks milk.
9. The Norwegian lives in the leftmost house.
10. The person who smokes Blend lives next to the person who keeps a cat.
11. The person who keeps a horse lives next to the person who smokes Dunhill.
12. The person who smokes Blue Master drinks beer.
13. The German smokes Prince.
14. The Norwegian lives next to the blue house.
15. The man who smokes Blend has a neighbour who drinks water.

Note:

A few precisions can be made to make things entirely clear. The houses are located side by side such that the leftmost and rightmost houses have only one neighbor house, while the three in the middle each has two neighbor houses (e.g. the houses do not stand in a ring). "next to", "on the left side of" and "neighbor" refer to immediately left to, next to etc.