You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

This list contains the top 25 accounts with the most followers on the social photo-sharing platform Instagram. As of May 2018, the most followed user is Instagram's own account, with over 235 million followers. Selena Gomez is the most followed individual, with over 137 million followers. Ten accounts have exceeded 100 million followers on the site.
Solution: who has the maximum number of followers on instagram
Why? The answer is talking about the Instagram accounts that have the most followers. The question asking about the maximum number of followers. So this is a good example.

New input: The Arch of Titus (Italian: Arco di Tito; Latin: Arcus Titi) is a 1st-century AD honorific arch, located on the Via Sacra, Rome, just to the south-east of the Roman Forum. It was constructed in c. AD 82 by the Emperor Domitian shortly after the death of his older brother Titus to commemorate Titus's victories, including the Siege of Jerusalem (AD 70). The arch has provided the general model for many triumphal arches erected since the 16th century -- perhaps most famously it is the inspiration for the Arc de Triomphe in Paris, France.
Solution:
the arch of titus was constructed in commemoration of a victory over