Definition: You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.
Input: The tower's tilt began during construction in the 12th century, caused by an inadequate foundation on ground too soft on one side to properly support the structure's weight. The tilt increased in the decades before the structure was completed in the 14th century. It gradually increased until the structure was stabilized (and the tilt partially corrected) by efforts in the late 20th and early 21st centuries.
Output:
was the leaning tower of pisa built leaning?