Question: Which pizzeria is primarily in Northern California, Mountain Mike's Pizza or Sarpino's Pizzeria?

Context paragraphs:
Northern California Open: The Northern California Open is a golf tournament played in the Northern California, open to both amateur and professional golfers.  It is run by the Northern California section of the PGA of America.  It has been played annually since 1920 at a variety of courses around the state.  It was considered a PGA Tour event in the 1920s.

Masahiko Minami (academic): Masahiko Minami (南 雅彦, Minami Masahiko) is a linguistics professor at San Francisco State University where he specializes in Japanese language and cross-cultural studies.  He is also President of the Foreign Language Association of Northern California (FLANC) and coordinator for the Japanese Language Proficiency Test (日本語能力試験, Nihongo Nōryoku Shiken: JLPT) for Northern California.  In addition, he was President of the Northern California Japanese Teachers’ Association (NCJTA).

Sarpino's Pizzeria: Sarpino's Pizzeria is a fast food restaurant chain specializing in pizza, with international operations headquartered in Singapore and U.S. operations headquartered in the Chicago suburb of Lincolnshire, Illinois.

Pizza My Heart (restaurant): Pizza My Heart is a chain of pizzeria restaurants in the San Francisco Bay Area.  The chain was founded in 1981 in Capitola, California by Fred Poulos and Keith Holtaway and is now owned by Chuck Hammers.  The chain currently has eighteen locations.  In 1997, the chain merged with Pizza-a-Go-Go, which was based in San Jose, California.  The new locations inherited the Pizza My Heart name.

California-style pizza: California-style pizza (also known as California pizza or Gourmet pizza) is a style of single-serving pizza that combines New York and Italian thin crust with toppings from the California cuisine cooking style.  Its invention is generally attributed to chef Ed LaDou, and Chez Panisse, in Berkeley, California.  Wolfgang Puck, after meeting LaDou, popularized the style of pizza in the rest of the country.  It is served in a number of California Cuisine restaurants.  Such restaurant chains as California Pizza Kitchen, Extreme Pizza, and Sammy's Woodfired Pizza are three major pizza franchises associated with California-style pizza.  Nancy Silverton's Pizzeria Mozza is also a popular California-style pizza restaurant in Los Angeles.

Northern California TRACON: Northern California TRACON (NCT) (Terminal Radar Approach Control), or NorCal TRACON for short, is an air traffic control facility that provides safety alerts, separation, and sequencing of air traffic arriving, departing, and transiting the airspace and airports in Northern California.  Located in Rancho Cordova near Sacramento, NCT controls airspace over 19000 square miles, and serves Reno International Airport, Sacramento International Airport, San Jose International Airport, Oakland International Airport, and San Francisco International Airport, plus 19 other smaller airports with air traffic control towers.  NCT is the 3rd busiest TRACON in America.  NorCal TRACON is the step between local control (in an airport's control tower) and Air Route Traffic Control Center (ARTCC), in this case, Oakland Center (ICAO code: ZOA).  San Francisco International Airport is the 2nd largest airport in California and the largest airport serving Northern California.

Mountain Mike's Pizza: Mountain Mike's Pizza is a chain of pizzerias mainly along the West Coast of the United States, primarily Northern California.  They have additional locations in Nevada, Oregon, and Utah.  The restaurants offer other items, such as pasta and chicken wings.

Big Mama's &amp; Papa's Pizzeria: Big Mama's & Papa's Pizzeria is a pizza restaurant chain primarily located in Southern California.  The chain is notable for its extremely large "Giant Sicilian" pizza, which is claimed to be the largest deliverable pizza in the world.  Additionally, the chain gained notoriety when, during the 2014 Academy Awards, host Ellen Degeneres had Big Mama's pizzas delivered onstage.

Northern California PGA Championship: The Northern California PGA Championship is a golf tournament that is the championship of the Northern California section of the PGA of America.  Mark Fry, long-time pro at Sequoyah Country Club in Oakland, California, holds the record for most victories with 10.  Tony Lema, British Open winner in 1964 and 12-time PGA Tour winner, won three consecutive Northern California PGA championships from 1962–64.  Other PGA Tour winners who were also victorious in the Northern California PGA Championship include Bob Lunn (six-time PGA tour winner), Dick Lotz (three-time PGA tour winner), Bruce Summerhays (three-time PGA tour winner, Bob Wynn, and John McMullin.

Tony's Pizza Napoletana: Tony’s Pizza Napoletana is a pizzeria located in San Francisco, California on Stockton Street which serves Neapolitan styled pizza.  In 2015, it is considered the 5th highest rated pizzeria in the United States by TripAdvisor.

Supporting paragraphs: Mountain Mike's Pizza Sarpino's Pizzeria
Answer: Mountain Mike's Pizza