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.

[EX Q]: Category: PUBLISHING 
Clue: After 7 years of planning, this magazine published a condensed version of the Bible in 1982
[EX A]: reader\'s digest

[EX Q]: Category: ARCHITECTS 
Clue: Dallas-Fort Worth Airport architect Gyo Obata helped design this Smithsonian museum
[EX A]: air & space museum

[EX Q]: Category: TUNNELS 
Clue: Also a style of staircase, it's the type of tunnel built in B.C.'s Yoho National Park to solve the problem of a steep grade
[EX A]:
spiral