user
Three eye's have I, all in a row.   When red, all freeze.   What am I?
A: shade
B: portal
C: stoplight
D: scull
E: private eye
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>