I'll give you a question, please answer with step-by-step reasoning process. When their litter box is full where might a cat go to the bathroom?\nOptions:\n- houseplant\n- bathtub\n- dumpsters\n- urban neighborhood\n- floor

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Cats go to the bathroom at the houseplant. Litter box of cats can get full. Houseplant is an indoor plant.
The answer: houseplant.
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