In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Q: Passage: Walsh first developed what would become the West Coast offense when he was offensive coordinator of the Cincinnati Bengals, working under legendary head coach Paul Brown. However, Walsh truly perfected this strategy as the head coach of the San Francisco 49ers. His teams were led by quarterback Joe Montana. Montana, who was noted for his ability to remain calm under pressure, also possessed good mobility and an accurate passing arm. Another important player in the 49ers offense was Roger Craig, a swift, speedy running back who could also catch passes out of the backfield and was a good receiver. Walsh's 49ers teams also featured several All-Pro wide receivers, including Dwight Clark, John Taylor, and Jerry Rice. The 49ers were one of the NFL's powerhouses in the 1980s and 1990s, under the guidance of head coaches Bill Walsh (1979–1988) and George Seifert (1989–1996). Walsh won three Super Bowls in the 1981, 1984 and 1988 seasons. Seifert won two Super Bowls in 1989 and 1994. Montana, Walsh and Rice are in the Pro Football Hall of Fame, and so is Montana's successor, quarterback Steve Young. Like Montana, Young was a great running quarterback and a very efficient passer. 
 Link Information: In the spring of 1993, at Montana's request, San Francisco traded Montana to the Kansas City Chiefs. Young was now the 49ers' undisputed starter, Question: What year did Montana's successor take over?

A: Answer: 1993
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Q: Passage: Born in Madrid, Truyol had a breakthrough season in 1996 when he came close to breaking into the top 100. Beginning the year ranked 238, by August he had made it to 104 in the world. In his first main draw appearance in an ATP Tour tournament, at the Trofeo Conde de Godó in Barcelona, Truyol reached the third round, with wins over Sándor Noszály and world number 25 Paul Haarhuis. A qualifier, he also managed to take eventual finalist Marcelo Ríos to three sets before being eliminated. Soon after he reached the second round of the Oporto Open and then won his first Challenger title, in Istanbul. He made his third ATP Tour appearance that season in Indianapolis and had an opening round win over the previous year's runner-up, Bernd Karbacher. In the second round he was beaten in three sets by Àlex Corretja. He made further main draw appearances in Bournemouth, Palermo and Tel Aviv to close out the year.
 Link Information: none Question: Out of the place where Ignacio was born and the one where he won his first Challenger title, which one has a larger population?

A: Answer: none
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Q: Passage: Alfred Stillé (October 30, 1813 – September 24, 1900) was an American physician. Born in Philadelphia, he studied classics at Yale, but was expelled for participating in the Conic Sections Rebellion. He then transferred to the University of Pennsylvania in the same year, where he received an A.B. degree in 1832. He went on to get an A.M. from the University of Pennsylvania in 1835 and in 1836 an M.D. from the school's department of medicine. He settled to practice in his native city, but spent parts of 1841 and 1851 in Paris and Vienna. From 1854 to 1859 he was professor of medicine at the Pennsylvania Medical College and from 1864 to 1884 at the University of Pennsylvania, later becoming its Chair. Stillé was one of the first in America to distinguish between typhus and typhoid fever. His observations in this connection he made during a typhus epidemic in Philadelphia in 1836 and reported in 1838. He acquired a great reputation as a practitioner, teacher, and writer, and was the first secretary, and in 1871–72 the president, of the American Medical Association. However, as evidenced by his later writings, he was also known for refusing to accept the germ theory or laboratory medicine.
 Link Information: In 1847, the American Medical Association was founded in Philadelphia by Nathan Smith Davis as a national professional medical organization.  Question: Who was the first president of the organization Alfred served as both secretary and president?

A:
Answer: Nathan Smith Davis
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