user
If I'm walking, then I must be running.   However if I'm running, I may be walking.   What am I?
A: path
B: hundred
C: moving forward
D: free
E: treadmill
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

E

<|end_of_solution|>