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: THE WINTER PALACE 
Clue: In 1881 the "Czar Liberator", the II czar of this name, asked to be taken to the palace to die after being fatally wounded
answer:
alexander ii


question:
Category: TV TITLE ROLES 
Clue: Orphaned 7-year-old Emmanuel Lewis
answer:
webster


question:
Category: THE "IX" IS IN 
Clue: An array of numbers or other mathematical functions multiplied according to certain rules
answer:

a matrix