user
What can be connected to a tree, but can be used in school?
A: root
B: gleditsia
C: pine
D: quince
E: obeche
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

A

<|end_of_solution|>