user
It occurs once in a minute, twice in a week and once in a year.  What is it?
A: hello
B: build up
C: twelve
D: eight
E: dono
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

E

<|end_of_solution|>