user
In an instant I reach the ground after being in the air, and I like to land in peoples hair.  what am I ????
A: promontory
B: bird poop
C: photograph
D: worm
E: airplanes
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>