Question: How long was the eiffel tower the tallest building in the world?
Answer: 41 years
Disambiguated annotations:
qaPairs: question: How long was the eiffel tower the tallest man-made structure in the world?
answer: 41 years
41
from 1889, when it was built, until 1930
question: How long was the eiffel tower the tallest tower in the world?
answer: 1889–1958