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.

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


[Q]: Category: IBSEN 
Clue: To avoid the amorous clutches of Judge Braque, this title heroine shoots herself
[A]: hedda gabbler


[Q]: Category: FLOWER POWER 
Clue: The genus of this purplish flower is also a musical instrument
[A]:
viola