There was once a college that offered a class on probability applied to the real world.The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it.
When everyone received the test it was a blank sheet of paper with a solitary question on it: ‘What is risk?’.

Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!

What did he write?