user
Billy went on Tuesday, but left on Friday.  How is this possible?
A: place
B: branches
C: horses name was tuesday
D: red light
E: someone
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>