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: 2-LETTER WORDS 
Clue: It's used to attract attention to something sighted on a ship, like land or a sail
ho

Category: PULITZER PRIZES 
Clue: Nicknamed "Black Jack", his memoir "My Experiences in the World War" won the 1932 Pulitzer Prize for History
general pershing

Category: ANTHONY HOPKINS FILMS 
Clue: In "Amistad", about an 1839 uprising of Africans on a slave ship, Hopkins played this former president arguing for the defense

john quincy adams