Please answer the following question by reasoning step-by-step.
If I put in my key and open a hinged door, where am I likely entering?\nOptions:\n- kitchen\n- safe\n- own house\n- building\n- pantry

own house
If you put in your key and open a hinged door, you are surely entering your own house.

Usually the main door of the Own house has a lock.

Putting in keys will open the hinged door of own house to enter.

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The answer: own house