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're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world. 
 Answer: 10,000,000 or less.
Solution: How many books are there in the British Library?
Why? In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input: Article: As a substitute teacher, my daily routine involves driving to a new school almost every day so I'm usually unable to anticipate the day's events, good or bad! On one particular day, I was teaching in a very difficult classroom. I was managing behavior all morning and by lunch time, I knew I needed coffee to even consider surviving the afternoon. So on my lunch break, I drove to a nearbyplaza to get a cup of coffee. Upon returning to the car I realized I had locked my keys and my phone inside! I had about 15 minutes to get back to the school which was a good 4 or 5-minute drive away. I contemplated  sprinting back, but it being winter, I thought a nasty fall on ice would only make the situation much worse. So I ran into a McDonald's which was in the same plaza and asked the man at the counter who happened to be the manager to please call me a cab. I briefly explained my situation to him, and I could tell by the look in his eyes, that he empathized. He hurried to the back to use the phone while I paced in the restaurant. I had less than 10 minutes to get back to my school at this point. The manager returned only to tell me that the cab company had put him on hold and then the line got disconnected, and that he was now on hold again, but had not yet been able to request the cab yet. My expression, I assume, began to resemble some combination of hopelessness and fear. Without a thought, he grabbed his coat and offered to drive me to the school. Without hesitation, I followed him into his car and made it back into my classroom with 2 minutes to spare before the bell! Upon arriving at the school, I thanked this man endlessly. His calmdemeanor and kind nature made me think he was probably a wonderful manager to work for, and also a wonderful human being to have on this earth. This experience makes me realize that out of every seemingly hopeless situation, there is the opportunity for acts of kindness totranspire , which can have an unimaginable impact on those who receive them. 
 Answer: Because he wanted something hot to drink.
Solution:
Why did the author go to get a coffee?