Definition: You are given a question. You need to detect which category better describes the question. A question belongs to the description category if it asks about description and abstract concepts. Entity questions are about entities such as animals, colors, sports, etc. Abbreviation questions ask about abbreviations and expressions abbreviated. Questions regarding human beings, description of a person, and a group or organization of persons are categorized as Human. Quantity questions are asking about numeric values and Location questions ask about locations, cities, and countries. Answer with "Description", "Entity", "Abbreviation", "Person", "Quantity", and "Location".

Positive Example 1 -
Input: What's the most common name in nursery rhymes ?
Output: Person

Positive Example 2 -
Input: What does the term ''spaghetti western'' mean ?
Output: Description

Negative Example 1 -
Input: What handicraft requires you to interlace your warp and weft ?
Output: Abbreviation

Negative Example 2 -
Input: What was the number of people that Randy Steven Craft was convicted of killing ?
Output: It is a quantity question.

Now complete the following example -
Input: How does a hydroelectric dam work ?
Output: 

Description