user
What has roots as nobody sees,  Is taller than trees,  Up, up it goes,  And yet it never grows?
A: primate
B: mountian
C: mississippian
D: make
E: ivory tree
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>