user
I am Dangerous and used only once.  My head is pulled of then I am tossed away and never used again.  what am I?
A: succession
B: absenteeism
C: gernade
D: theme
E: eyeballs
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>