user
The higher I climb, the hotter I engage, I can not escape my crystal cage.   What am I?
A: crystal meth lab
B: genius
C: silver chloride
D: mercury in a thermometer
E: chipped
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

D

<|end_of_solution|>