Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Colourful celebrations continued in Jerusalem today where ultra-orthodox Jewish men gathered to dance in honour of the the traditional festival of Purim. Revellers and children also met in the streets of the city dressed up as kings and queens, clowns, animals and even superheroes to celebrate. Yesterday saw similar festivities sweep across the world with thousands of Jewish families in London also celebrating the event in style. The holiday commemorates the salvation of the Jewish people in ancient Persia after a beautiful queen, Esther, foiled a royal advisor's plot to annihilate all the country's Jews in just one day.Thousands of people took to the streets of the Israeli capital today to mark the annual festival of PurimThe holiday commemorates the foiling of a 5th century plot to annihilate all Jews in ancient Persian empireCelebrations have been held around the world, including London, with children encouraged to wear fancy dress 
 Question:It is traditional for observers to dress as _, and this group of young girls make a team perfect princesses as they mark Purim in north London.

Esther