user
Lovely and round, I shine with pale light, Grown in the darkness, a lady's delight. 
A: hydrogen
B: coast
C: reflection
D: deep
E: pearls
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

E

<|end_of_solution|>