user
when did the dog say food
A: flea
B: at 500
C: luau
D: bouviers des flandres
E: carbohydrate
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>