Determine the topic of the question. Question: "What is Ischemia or infarction??" Topic:
----
Answer: Ischemia

Determine the topic of the question. Question: "what chili wants wiki?" Topic:
----
Answer: What Chilli Wants

Determine the topic of the question. Question: "what channel is letterman on?" Topic:
----
Answer:
Late Show with David Letterman