Final answer:
Prophet Yusuf was released from prison after interpreting the Egyptian king's dreams, which led to his appointment as an advisor for the upcoming famine.
Step-by-step explanation:
The story of Prophet Yusuf (Joseph) being released from prison can be found in religious texts, specifically in Islamic tradition and the Qur'an. After being falsely accused and imprisoned, Prophet Yusuf remained in prison until the Egyptian king had a dream that no one could interpret. Yusuf's ability to interpret dreams was made known to the king by a former prison-mate who remembered Yusuf's talent. Yusuf successfully interpreted the king’s dreams, predicting seven years of plenty followed by seven years of famine. Impressed by Yusuf's wisdom, the king ordered his release from prison and appointed him as an advisor and supervisor over the granaries in preparation for the coming famine.