In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

[EX Q]: Question: Where was McMahon's post-doctoral mentor from? Passage 1:Ain't She Sweet was an American album featuring four tracks recorded in Hamburg in 1961 by The Beatles featuring Tony Sheridan (except for the title song with vocal by John Lennon) and cover versions of Beatles and British Invasion-era songs recorded by the Swallows. As Atlantic Records only had rights to four Sheridan/Beatle recordings recorded by Polydor Records, they filled the rest of the album with Beatle and British Invasion cover songs. When this material was released by Atco Records, there were mono (catalogue number 33-169) and stereo (SD 33-169) editions. Atco also added additional drum overdubs to the four Sheridan cuts on top of the original drum tracks. American drummer Bernard Purdie claims to have performed overdubs of unspecified Beatles records, which would most likely have been for Ain't She Sweet, but this has never been officially confirmed.
Passage 2:McMahon contributed to the understanding of retinal neurophysiology alongside his post-doctoral mentor, John E. Dowling. His early research focused on ion channels that mediate transmission at electrical and glutamatergic synapses and the modulatory effects of dopamine and nitric oxide on retinal synapse networks. Through studies with zebrafish he discovered that the neurotransmitter dopamine decreases the electrical coupling within horizontal cells. Further research showed that it was the increase of cAMP within the cell resulting from dopamine binding to AMPA receptor that led to this decrease in coupling. McMahon and his colleagues also demonstrated that exogenous nitric oxide and zinc can modulate AMPA receptor mediated synaptic transmission at gap junctions in hybrid bass retinal neurons.
Passage 3:The river starts at Ralph Bice Lake (formerly Butt Lake) in northern Algonquin Provincial Park in the geographic township of Butt in the Unorganized South Part of Nipissing District. It flows south to Daisy Lake then east to Big Trout Lake. The river heads north out the lake over Big Trout Lake Dam, takes in the left tributary Tim River, flows over the Portal Rapids, Cedar Rapids, Snowshoe Rapids, Catfish Rapids, and Stacks Rapids to reach Cedar Lake, the location of the community of Brent, where it takes in the left tributary Nipissing River. The river exits the lake over a dam, heads through the Devil's Chute, reaches Radiant Lake, where it takes in the left tributary North River and right tributary Little Madawaska River, and passes through the Squirrel Rapids, Big Sawyer Rapids, Battery Rapids Cascade Rapids and White Horse Rapids, and takes in the right tributary Crow River. The river then continues through a series of rapids including the Devil's Cellar Rapids, passes the Algonquin Radio Observatory, and reaches Lake Travers. The Petawawa River enters a canyon and passes through numerous rapids including the Big Thompson Rapids, Little Thompson Rapids, Grillade Rapids, Crooked Chute, Rollway Rapids, The Natch, Schooner Rapids, Five Mile Rapids to arrive at Whitson Lake adjacent to the Petawawa Hills. It leaves Algonquin Provincial Park and enters the municipality of Laurentian Hills in Renfrew County, continues southeast past CFB Petawawa, passes through the Crooked Rapids, Race Horse Rapids, White Horse Rapids and Halfmile Rapids, and reaches Lac du Bois Dur, where it takes in the right tributary Barron River. The river enters the town of Petawawa, heads under Ontario Highway 17, through the Big Eddy Rapids, under the Canadian Pacific Railway main line, and empties into Black Bay on the Ottawa River.

[EX A]: 2

[EX Q]: Question: How long did the financial period last that delayed work on the park? Passage 1:Gary di Silvestri is a graduate of Monsignor Farrell High School in Staten Island, New York, where he was a member of the football, wrestling and track & field teams. He graduated salutatorian and was awarded the top student athlete on Staten island. He has an undergraduate degree from Georgetown University where he graduated Magna Cum Laude and was inducted into the Phi Beta Kappa National Honor Society. Gary also has a Masters of Business Administration from Columbia University, where he graduated with honors and was inducted into the Beta Gamma Sigma national honors society. He has had a long career in financial services, having worked for Credit Suisse First Boston in London, England; and Morgan Stanley in both London and New York City. In 1997, di Silvestri founded Deutsche Suisse Asset Management, and he said his business success had allowed him to pursue philanthropy full time.
Passage 2:On November 29, 2017, at 3 p.m., after playing "End Game" by Taylor Swift, WQMP flipped to alternative rock as Alt 101.9joining several other former "AMP Radio"-branded stations in switching to the format and brand after the completion of the Entercom merger. The change brought the format back to a full-market signal in Orlando for the first time since 2008, when sister station WOCL flipped to classic hits. The most recent analog broadcast station to air the format full-time, Cox Media's W297BB/WCFB-HD2, was aired on a translator and an HD sub-channel, and aired from June 2014 to January 2016. Elsewhere in the Orlando market, iHeartMedia's talk-formatted WTKS-FM features alternative on nights and weekends, and is also aired on two HD subchannels in the Orlando market, WOCL HD2 and WJRR HD3, the latter of which also uses the brand Alt as standardized by iHeartMedia; this name conflict resulted in WQMP quietly changing its on-air brand to FM 101.9. WQMP's flip to alternative made former sister station WXXL the de facto CHR station in Orlando, until WPYO flipped to CHR from an urban-leaning rhythmic contemporary format in April 2018.
Passage 3:A $2.5 million bond issue passed in 1922 for a stadium conceived by Burnham. Designed by architects Holabird & Roche and named Soldier Field for the veterans of World War I, cost overruns required another bond issue in 1926. By 1924, the breakwater wall stretched from 14th to 55th Streets. In 1926, Soldier Field and a portion of Lake Shore Drive were opened. Landfilling extended from 23rd Street to 56th Street; however, Promontory Point was not complete, prompting complaints regarding garbage, blowing sand and odors. Throughout the 1920s and 1930s, landfill efforts continued to fill in Burnham Park and the adjacent Northerly Island. The South Development was named for Daniel Burnham on January 14, 1927, and support increased for a world's fair in the park. Construction was completed on Lake Shore Drive, with northbound lanes named for Leif Erikson, and southbound lanes for Christopher Columbus. In 1929, construction of the park at Promontory Point began. The Great Depression delayed work and prevented construction of nearshore islands. Burnham Park was chosen for the site of the Century of Progress world's fair and a yacht basin was built south of 51st Street.

[EX A]: 3

[EX Q]: Question: When was the Bureau of Scientific Relations disbanded? Passage 1:Rafael "Rafi" Eitan (; 23 November 1926 23 March 2019) was an Israeli politician and intelligence officer. He also led Gil and served as Minister of Senior Citizens. He was in charge of the Mossad operation that led to the arrest of Adolf Eichmann. He served as an advisor on terrorism to Prime Minister Menachem Begin, and in 1981 he was appointed to head the Bureau of Scientific Relations, then an intelligence entity on par with Mossad, Aman and Shabak. Eitan assumed responsibility for and resigned over the Jonathan Pollard affair, and the Bureau was disbanded. He was subject to an arrest warrant issued by the United States FBI. From 1985 until 1993, he was head of the government's Chemicals company, which was expanded under his leadership. After 1993, he became a businessman, noted for several large scale agricultural and construction ventures in Cuba. He was the chairman of the Vetek (Seniority) Association the Senior Citizens Movement.
Passage 2:In January 1996 former National Geographic photographer Charles O'Rear was on his way from his home in St. Helena, California, in the Napa Valley north of San Francisco, to visit his girlfriend, Daphne Irwin (whom he later married), in the city, as he did every Friday afternoon. He was working with Irwin on a book about the wine country. He was particularly alert for a photo opportunity that day, since a storm had just passed over and other recent winter rains had left the area especially green. Driving along the Sonoma Highway (California State Route 12 and 121) he saw the hill, free of the vineyards that normally covered the area; they had been pulled out a few years earlier following a phylloxera infestation. "There it was! My God, the grass is perfect! It's green! The sun is out; there's some clouds," he remembered thinking. He stopped somewhere near the NapaSonoma county line and pulled off the road to set his Mamiya RZ67 medium-format camera on a tripod, choosing Fujifilm's Velvia, a film often used among nature photographers and known to saturate some colors. O'Rear credits that combination of camera and film for the success of the image. "It made the difference and, I think, helped the 'Bliss' photograph stand out even more," he said. "I think that if I had shot it with 35 mm, it would not have nearly the same effect." While he was setting up his camera, he said it was possible that the clouds in the picture came in. "Everything was changing so quickly at that time." He took four shots and got back into his truck. According to O'Rear, the image was not digitally enhanced or manipulated in any way.
Passage 3:In 1998, one week after winning E3 Harelbeke and the Brabantse Pijl in the same weekend, he won the Tour of Flanders, thereby equaling the race's record of three wins. One week later, Museeuw made a horrific fall in ParisRoubaix on the Trouee d'Arenberg cobbled sector, leaving his kneeknap shattered. On top came a dangerous gangrene infection which nearly forced doctors to amputate his left leg. He fought back and resumed cycling after a long healing process, finishing third in the Tour of Flanders of 1999 and ninth in ParisRoubaix, exactly one year after his horror crash. In 2000 he won ParisRoubaix a second time after a 44km solo. Upon crossing the finish line in victory, he lifted his left leg, pointing to his knee as a reminder of the injury that had almost ended his career two years before. Later that year, he was again injured in a motor cycle accident, causing a severe head trauma and several days in a coma. His dogged determination and powerful riding style won him legions of fans all over the world and made him all the more popular in his native Flanders.

[EX A]:
1