In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

[EX Q]: Question: Did the Jedburgh Railway only serve Jedburgh? Passage:The Waverley Route spawned a series of branches serving the towns and villages in the Scottish Borders: a branch line from Kelso Junction near reached Kelso where it met an NER branch from . The NBR Chairman, Richard Hodgson, sought to link the Waverley Route with the Edinburgh-Berwick line between Ravenswood Junction, north of St Boswells, and ; the branch between Reston and Duns had been completed in 1849 and a western section to St Boswells was promoted as the Berwickshire Railway. It opened throughout on 2 October 1865. Other towns to be connected were Jedburgh by the independent Jedburgh Railway which was inaugurated on 17 July 1856 and worked by the NBR, and Selkirk via the Selkirk and Galashiels Railway, also opened in 1856 and operated by the NBR, while Langholm received a branch from , and Gretna one from . One of the last branches to be constructed was the Lauder Light Railway in 1901; this replaced an omnibus subsidised by the NBR providing access from the town of Lauder, famed for its trout, and connecting with trains at .
 Links: a. Langholm b. Lauder Light Railway c. Lauder d. Jedburgh Railway
[EX A]: d

[EX Q]: Question: How many people died in the incident that contaminated about 30,000 km?  Passage:Natural strontium is a mixture of four stable isotopes: Sr, Sr, Sr, and Sr. Their abundance increases with increasing mass number and the heaviest, Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic Sr as the daughter of long-lived beta-decaying Rb. Of the unstable isotopes, the primary decay mode of the isotopes lighter than Sr is electron capture or positron emission to isotopes of rubidium, and that of the isotopes heavier than Sr is electron emission to isotopes of yttrium. Of special note are Sr and Sr. The former has a half-life of 50.6 days and is used to treat bone cancer due to strontium's chemical similarity and hence ability to replace calcium. While Sr (half-life 28.90 years) has been used similarly, it is also an isotope of concern in fallout from nuclear weapons and nuclear accidents due to its production as a fission product. Its presence in bones can cause bone cancer, cancer of nearby tissues, and leukemia. The 1986 Chernobyl nuclear accident contaminated about 30,000 km with greater than 10 kBq/m with Sr, which accounts for 5% of the core inventory of Sr.
 Links: a. Rubidium b. Mass number c. Electron capture d. Chernobyl disaster
[EX A]: d

[EX Q]: Question: How many World Cups did the person who Klammer finished second behind in 1973 win? Passage:Klammer first showed signs of promise in the second half of the 1973 World Cup season, finishing second in the St. Anton downhill behind Bernhard Russi of Switzerland, the reigning Olympic and World Cup downhill champion. Klammer, age 19, followed this up with a third at St. Moritz and a third in the giant slalom at Mont Sainte-Anne (the only time he finished on the podium in a World Cup Giant Slalom in his career). The following season he finished second in the downhill standings behind Roland Collombin of Switzerland, his nemesis that season. After beating Collombin and Russi at Schladming in December 1973 under terrible conditions, Collombin bested him at Garmisch, Avoriaz, and Wengen. In December 1974, Collombin fell at Val-d'Isère, as he had the previous year. This time Collombin broke his back in a training run, unfortunately ending his promising career. Klammer won that race and every other downhill that 1975 season, except Megève, where one of his skis came off; without this incident, he would have won the overall World Cup title in March 1975, due to a good slalom result two days before at Chamonix, which would have granted him at least a third place (15 points) for the AK-combined of slalom Chamonix / downhill Megève. In the Olympic test event at Patscherkofel at Innsbruck in January 1975, Klammer had defeated defending Olympic champion Bernhard Russi of Switzerland, the runner-up, by nearly a half-second.
 Links: a. Bernhard Russi b. 1974–75 FIS Alpine Ski World Cup c. Bernhard Russi d. Garmisch Classic
[EX A]:
a