I'll give you a question, please answer with step-by-step reasoning process. They say dogs are a man's best friend, this is because of dog's pack mentality and being what?\nOptions:\n- four legs\n- frightening\n- found outside\n- tail\n- faithful

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Faithful is remaining loyal and steadfast. They say dogs are a man's best friend, this is because of dog's pack mentality and being faithful.
The answer: faithful.
Assistant