Task: Explanation
Input (English): The San Francisco Fire Department (SFFD) provides fire and emergency medical services to the City and County of San Francisco, California. The San Francisco Fire Department, along with the San Francisco Police Department and San Francisco Sheriff's Department, serves an estimated population of 1.4 million people, which includes the approximately 850,000 citizens residing in the 47.5 sqmi of San Francisco (including Treasure Island, Yerba Buena Island, San Francisco-Oakland Bay Bridge, Golden Gate Bridge, Alcatraz Island, the San Francisco International Airport, and the Presidio of San Francisco/Golden Gate National Recreation Area. Question:  The San Francisco Fire Department provides services to a small island that was used as a what from 1934 until 1963? Answer: federal prison
Output (English):  The San Francisco Fire Department, along with the San Francisco Police Department and San Francisco Sheriffs Department, serves an estimated population of 1.4 million people, which includes the approximately 850,000 citizens residing in the 47.5 sqmi of San Francisco including Treasure Island, Yerba Buena Island, San FranciscoOakland Bay Bridge, Golden Gate Bridge, Alcatraz Island, the San Francisco International Airport, and the Presidio of San FranciscoGolden Gate National Recreation Area.