I'll give you a question, please answer with step-by-step reasoning process. Sarah opened his chest and found a second heart. Her patient might not be what?\nOptions:\n- istanbul\n- animal\n- antique shop\n- human being\n- bedroom

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Human being only has one heart. Creature with a second heart is not a human being. Human being is a living being. Human beings are also called homosapiens.
The answer: human being.
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