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 consistency, answers should be in all lower cased letters.

Category: BUSINESS MEN 
Clue: This company founded by Berry Gordy Jr. celebrated its 40th anniversary in 1998
motown records

Category: MOTHER GOOSE 
Clue: It's the type of nail referred to in the nursery rhyme "All for Want of a Nail"
a horseshoe nail

Category: OLLA PODRIDA 
Clue: People who daydream are said to be "Building" these "in Spain"

castles