instruction:
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.
question:
Category: 1998 BUSINESS NEWS 
Clue: The Silver Seraph, the 9th new model in its 92-year history, is its first built on a moving assembly line
answer:
rolls-royce


question:
Category: HOTELS 
Clue: The U.S. investigation into the Titanic was first held in this hotel owned by one of the victims
answer:
waldorf astoria


question:
Category: U.S. CITIES 
Clue: Of the USA's 10 most populous cities, 1 of the 2 that dropped in population from 1990 to 2000
answer:

detroit or philadelphia