TASK 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".
PROBLEM: What is the difference between classical conditioning and operant conditioning ?

SOLUTION: Description

PROBLEM: What substance did Joseph Priestley name for its ability to erase pencil marks ?

SOLUTION: Entity

PROBLEM: What TV quiz show left the air in 1975 to the tune of Vera Lynn 's We 'll Meet Again ?

SOLUTION:
Entity