You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: TRINIDADIAN AMATEUR ICHTHYOLOGISTS 
Clue: This common aquarium fish was named for a Trinidadian clergyman
guppy

Category: BUSINESS & INDUSTRY 
Clue: 1 of the top 10 companies that operated food services in 1964, in 1994 its lunch counters ranked No. 264
woolworth\'s

Category: BUSINESS & INDUSTRY 
Clue: On July 16, 1995 this company made its first sale, a science textbook

amazon.com