user
I hold up the sky  I hold many pounds  just so you know  I can never fall on the *ground*  I am made of the world  without me you'll die  the ones who survive   are the ones that can fly
A: milky way
B: short
C: album
D: ground
E: diptera
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

D

<|end_of_solution|>