user
The one who makes sells it  The one who buys it doesn't use it  The one who is using doesn't know he's using it  What is it????????
A: hold
B: casket
C: accounting
D: usage
E: maker
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>