I'll give you a question, please answer with step-by-step reasoning process. A lonely man committed suicide, why would he do that?\nOptions:\n- suffering\n- he was happy\n- avoid problems\n- unhappy\n- end pain

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When a person is lonely, he becomes unhappy. When a person becomes unhappy for a long time, he becomes depressed. Depression is the main reason behind suicide.
The answer: unhappy.
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