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".
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Question: What astronomer-architect designed the present St. Paul 's Cathedral in London ?

Answer: Person


Question: Why do some clothing labels say `` Use a nonchlorine bleach '' ?

Answer: Description


Question: What is a tonne ?

Answer:
Description