Task: Question Answering
Input (English): Passage: The top employer in the city is the city government itself, employing 5.3% (25,000+ people) of the city's population, followed by UCSF with over 22,000 employees. Third—at 1.8% (8,500+ people)—is California Pacific Medical Center, the largest private-sector employer. Small businesses with fewer than 10 employees and self-employed firms make up 85% of city establishments, and the number of San Franciscans employed by firms of more than 1,000 employees has fallen by half since 1977. The growth of national big box and formula retail chains into the city has been made intentionally difficult by political and civic consensus. In an effort to buoy small privately owned businesses in San Francisco and preserve the unique retail personality of the city, the Small Business Commission started a publicity campaign in 2004 to keep a larger share of retail dollars in the local economy, and the Board of Supervisors has used the planning code to limit the neighborhoods where formula retail establishments can set up shop, an effort affirmed by San Francisco voters. However, by 2016, San Francisco was rated low by small businesses in a Business Friendliness Survey.Like many U.S. cities, San Francisco once had a significant manufacturing sector employing nearly 60,000 workers in 1969, but nearly all production left for cheaper locations by the 1980s. As of 2014, San Francisco has seen a small resurgence in manufacturing, with more than 4,000 manufacturing jobs across 500 companies, doubling since 2011. The city's largest manufacturing employer is Anchor Brewing Company, and the largest by revenue is Timbuk2. 
Question: Who is San Francisco's top employeer?
Output (English): the city government.