I'll give you a question, please answer with step-by-step reasoning process. Bill loved riding his bike and did it all the time. He had trouble going up hills and sometimes pushed himself to the point of what?\nOptions:\n- falling down\n- give up\n- exhaustion\n- travelling\n- going somewhere

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Bill loved riding his bike all the time but at a certain point of time he feels exhaustion. Bill sometimes pushed himself to the point of exhaustion when he had trouble in going up to hills.
The answer: exhaustion.
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