user
There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.  What is it?
A: rodeo
B: ax
C: par
D: cliffhanger
E: boxing
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

E

<|end_of_solution|>