Please answer the following question by reasoning step-by-step.
It turned out it wasn't a kidney stone, what might it have been a stone in?\nOptions:\n- gallbladder\n- creek bed\n- driveway\n- river bed\n- gravel

gallbladder
A stone can be present in gall bladder.

Gallbladder is a part of human body like a kidney.

.

So, the final answer is gallbladder