Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
The question can be categories like below:
Animal, NAME_1 of body, Color, Invention, book and other creative piece, Currency name, Disease and medicine, Event, Food, Musical instrument, Language, Letter like a-z, Other entity, Plant, Product, Religion, Sport, Element and substance, Symbols and sign, Techniques and method, Equivalent term, Vehicle, Word with a special property

Below is some example of classifications. The format is the question followed by classification tag:
1. What animal 's tail is called a brush ? <classification> Animal </classification>
1. What are the most common breeding birds in the U.S. ? <classification> Animal </classification>
2. Which leg does a cat move with its left front leg when walking - its left rear or right rear leg ? <classification> NAME_1 of body </classification>
2. What carries sperm up into the pelvic region ? <classification> NAME_1 of body </classification>
3. What color bottles do good Rhine wines come in ? <classification> Color </classification>
3. What color is the eight-ball in pocket billiards ? <classification> Color </classification>
4. What was the first NAME_2 novel ? <classification> Invention, book and other creative piece </classification>
4. What was the non-fiction best-seller of 1952 , 1953 and 1954 ? <classification> Invention, book and other creative piece </classification>
5. What money was used by them ? <classification> Currency name </classification>
5. What type of currency is used in China ? <classification> Currency name </classification>
6. What is a fear of punishment ? <classification> Disease and medicine </classification>
6. What is a fear of strong light ? <classification> Disease and medicine </classification>
7. What are some of the significant historical events of the 1990s ? <classification> Event </classification>
7. What feud ended with a marriage in Kentucky on March 21 , 1891 ? <classification> Event </classification>
8. What was the food of the Greek gods called ? <classification> Food </classification>
8. What is NAME_3 NAME_4 's favorite drink during office hours ? <classification> Food </classification>
9. What instrument does NAME_5 play ? <classification> Musical instrument </classification>
9. What instrument does NAME_5 play ? <classification> Musical instrument </classification>
10. What 's the official language of Algeria ? <classification> Language </classification>
10. What language is mo