user
I've got your back, but I can let you down.   I can tell te truth, but I can also lie.   I can be nice, but also mean.   I can make you laugh, but I can make you cry.   I can stay the same,but I can change.   What am I?
A: truth
B: stays
C: out
D: ally
E: im a sibling
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

E

<|end_of_solution|>