user
You use it between your head and your toes, the more it works the thinner it grows.   What is it?
A: machine
B: management
C: bar of soap
D: ballet
E: assist
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>