[Answer] 5. May 1931 saw the official opening of which iconic building, one of the tallest in the world?

Step 1 : Introduction to the question "5. May 1931 saw the official opening of which iconic building, one of the tallest in the world?"

...1. Big Ben 2. Eiffel Tower 3. Empire State Building 4. CN Tower The Empire State Building was the tallest in the world until 1972, when the North Tower of the World Trade Centre was completed. Following the tragic events of 2001, the Empire State Building again became the tallest building in New York. The Burj Khalifa, in Dubai, became the tallest in the world on its opening in 2010. The Eiffel Tower in Paris was the world's tallest structure from 1889 until 1930 and Toronto's CN Tower held the accolade between 1976 and 2010. The clock tower of Big Ben in London is among the tallest free standing clock towers in the world.

Step 2 : Answer to the question "5. May 1931 saw the official opening of which iconic building, one of the tallest in the world?"

Empire State Building:

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