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: PART: CHARLES 
Clue: In the '80s, he played Charles Ryder, a central character in TV's "Brideshead Revisited"
answer:
jeremy irons


question:
Category: HISTORIC EUROPEAN LEADERS 
Clue: On June 15, 1961 Walter Ulbricht assured journalists that "No one intends to build a wall" dividing this city
answer:
berlin


question:
Category: U.S. CONSTITUTION 
Clue: The only amendment to be ratified by state conventions rather than by legislatures
answer:

the 21st amendment, repealing prohibition