user
There was once a man who had a room called 17NO but he never went inside. Why?
A: regret
B: togo
C: because there was a lion
D: place
E: spare room
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>