user
Adored by few,   Feared and hated by many.    Mistress of the entire universal reason,   Master in the art of numbers.    Some may have solved many of your mysteries,   But there still much of them to find.   What are they?
A: limit
B: thirty
C: root
D: quantity
E: mathematics
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

E

<|end_of_solution|>