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.
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Question: Category: ARCHITECTS 
Clue: This woman designed NYC's Museum for African Art, as well as a famous memorial in Washington, D.C.

Answer: maya ying lin


Question: Category: PRESIDENTS 
Clue: 2 of the 3 successive presidents who were Republicans, born in Ohio & generals in the Union army

Answer: ulysses s. grant, rutherford b. hayes & james a. garfield


Question: Category: ROYALTY 
Clue: If Prince Charles keeps his name when he becomes king, this number will follow it

Answer:
charles iii