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

SOLUTION: Entity

PROBLEM: Who played the title role in My Favorite Martian ?

SOLUTION: Person

PROBLEM: Who was the first American world chess champion ?

SOLUTION:
Person