user
My tail is long, my coat is brown,  I like the country, I like the town.   I can live in a house or live in a shed,  And I come out to play when you are in bed.   What am I?
A: quarter
B: mouse
C: process
D: region
E: egg
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>