In this task, you will be shown an extract from a movie plot and a question. You need to provide the correct answer for it. Short answers containing words that are present in the passage are preferred.

Let me give you an example: Twenty-year-old Will Hunting of South Boston is a self-taught, genius-level intellect, though he works as a janitor at the Massachusetts Institute of Technology and spends his free time drinking with his friends, Chuckie (Ben Affleck), Billy (Cole Hauser) and Morgan (Casey Affleck). When Professor Gerald Lambeau (Stellan Skarsgard) posts a difficult mathematics problem as a challenge for his graduate students, Will solves the problem anonymously, stunning both the graduate students and Lambeau himself. As a challenge to the unknown genius, Lambeau posts an even more difficult problem. Lambeau chances upon Will solving the problem but Will flees the scene. That night at a bar, Will meets Skylar (Minnie Driver), a British student about to graduate from Harvard, who plans on attending medical school at Stanford and gives Will her phone number before leaving., Question: How old is Will Hunting in the movie ?
The answer to this example can be: Answer: Twenty years
Here is why: This is a good example which results in a factoid answer.

OK. solve this:
Set during the height of the First World War, Passchendaele tells the story of Sergeant Michael Dunne (Paul Gross), a soldier who is brutally wounded in France and returns to Calgary emotionally and physically scarred. While in the military hospital in Calgary, he meets Sarah (Caroline Dhavernas), a mysterious and attractive nurse with whom he develops a passionate love. When Sarah's younger asthmatic brother David (Joe Dinicol) signs up to fight in Europe, Michael feels compelled to return to Europe to protect him. Michael and David, like thousands of Canadians, are sent to fight in the third battle of Ypres, a battle against impossible odds, commonly known as "Passchendaele". It is a story of passion, courage and dedication, showing the heroism of those that fought in battle, and of the ones that loved them., Question: What war does Passchendaele take place ?
Answer:
Answer: World war one.