You'll find a landing at the top of what?\nOptions:\n- ocean\n- apartment building\n- stairwell\n- airport\n- room
Step-by-step reasoning process below:

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Stairwell is a shaft in a building in which a staircase is built. Stairwell is a compartment extending vertically through a building in which stairs are placed. You'll find a landing at the top of stairwell. The answer: stairwell.
Assistant