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 EARLY 1900s 
Clue: These 2 nations fought a war on neither nation's soil; the decisive battle came at present-day Shen-Yang
answer:
russia & japan


question:
Category: INVENTORS 
Clue: Mainz, Germany celebrates the life of this inventor in an annual festival called Johannisnacht
answer:
johannes gutenberg


question:
Category: 1990s AFRICA 
Clue: In 1994 these 2 African countries' presidents Habyarimana & Ntaryamira died in a plane crash
answer:

rwanda & burundi