Input: Read this: In chemical terms, the difference between hardwood and softwood is reflected in the composition of the constituent lignin. Hardwood lignin is primarily derived from sinapyl alcohol and coniferyl alcohol. Softwood lignin is mainly derived from coniferyl alcohol.
Question: Which type of alcohol mainly becomes softwood lignin?

Output: coniferyl

Input: Read this: The Arena Football League briefly had a two-game exhibition season in the early 2000s, a practice that ended in 2003 with a new television contract. Exhibition games outside of a structured season are relatively common among indoor American football leagues; because teams switch leagues frequently at that level of play, it is not uncommon to see some of the smaller leagues schedule exhibition games against teams that are from another league, about to join the league as a probational franchise, or a semi-pro outdoor team to fill holes in a schedule.
Question: Indoor league teams sometimes play against what type of outdoor league team?

Output: semi-pro

Input: Read this: The Yiddish linguist Max Weinreich published the expression, A shprakh iz a dialekt mit an armey un flot (" ": "A language is a dialect with an army and navy") in YIVO Bleter 25.1, 1945, p. 13. The significance of the political factors in any attempt at answering the question "what is a language?" is great enough to cast doubt on whether any strictly linguistic definition, without a socio-cultural approach, is possible. This is illustrated by the frequency with which the army-navy aphorism is cited.
Question: When did Max Weinrich write "A shprakh iz a dialekt mit an armey un flot"?

Output: 1945

Input: Read this: In 2010, Indira Gandhi International Airport (IGIA) was conferred the fourth best airport award in the world in the 1525 million category, and Best Improved Airport in the Asia-Pacific Region by Airports Council International. The airport was rated as the Best airport in the world in the 2540 million passengers category in 2015, by Airports Council International.[not in citation given][better source needed] Delhi Airport also bags two awards for The Best Airport in Central Asia/India and Best Airport Staff in Central Asia/India at the Skytrax World Airport Awards 2015.
Question: What year did Indira Gandhi International Airport win an award for Best airport in the world in the 25-40 million passenger category?

Output:
2015