Detailed Instructions: In this task, you will be shown a conversation. You need to write a question with three choices for the conversation. Your question should be answerable based on the conversation and only have one correct answer. Note that you don't need to answer your question. "W" and "M" in the conversations stand for "woman" and "man".
Q: M: The teacher called off the lecture. W: Oh, really? His student John must be disappointed at this news.
A:
Who is John? (A) Teacher. (B) Student. (C) Nurse.