dialogue: W: Do you know that John's health took a turn for the worse? M: But he used to be as strong as a horse. W: You will never know when your health will fail all of a sudden. M: It's one of the misfortunes in life, isn't it? W: It sure is. M: So health is more valuable than anything else. No matter how much money we have, you can not buy good health with it. W: I quite agree with you, and similarly, honors can never equal good health either. M: To conclude, we should try our best to keep us as healthy as possible.
question: What happened to John?
choice: He had an accident. His health suddenly failed. He turned around suddenly.
answer: His health suddenly failed.