For what reason did he commit the killing?\nOptions:\n- investigation\n- disease\n- punishment\n- retribution\n- going to jail
Let's think carefully first. Step-by-step reasoning process:
User
Retribution means punishment for a crime. Retribution is what judge gives after studying the case or after a criminal trial. Retribution was the reason for why he commits the killing. So the final answer is retribution.
Assistant