user
I am terrifying, and fear inspiring  The physical world cannot touch me  When i am finished, you might not remember what i did.   What am I?
A: bore
B: time limit
C: nightmare
D: border
E: dreaming
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>