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 Input:
Question: How high is the gamma radiation from nuclear fuel? Passage:The nuclear fuel elements were made of refractory ceramic based on beryllium oxide, with enriched uranium dioxide as fuel and small amount of zirconium dioxide for structural stability. The fuel elements were hollow hexagonal tubes about long with distance between the outer parallel planes, with inside diameter of . They were manufactured by high-pressure extruding of the green compact, then sintering almost to its theoretical density. The core consisted of 465,000 individual elements stacked to form 27,000 airflow channels; the design with small unattached elements reduced problems related with thermal stresses. The elements were designed for average operation temperature of ; the autoignition temperature of the reactor base plates was only 150 °C higher. The neutron flux was calculated to be 9×10 neutrons/(cm·s) in the aft and 7×10 neutrons/(cm·s) in the nose. The gamma radiation level was fairly high due to the lack of shielding; radiation hardening for the guidance electronics had to be designed.
 Links: a. Beryllium oxide b. Radiation hardening c. Nuclear fuel d. Radiation hardening

Ex Output:
c


Ex Input:
Question: How old was Itagaki Taisuke when he started The Freedom and People's Rights Movement? Passage:A major proponent of representative government was Itagaki Taisuke, a powerful leader of Tosa forces who had resigned from his Council of State position over the Korean affair in 1873. Itagaki sought peaceful rather than rebellious means to gain a voice in government. Such movements were called The Freedom and People's Rights Movement. He started a movement aimed at establishing a constitutional monarchy and a national assembly. Itagaki and others wrote the Tosa Memorial in 1874 criticizing the unbridled power of the oligarchy and calling for the immediate establishment of representative government. Dissatisfied with the pace of reform after having rejoined the Council of State in 1875, Itagaki organized his followers and other democratic proponents into the nationwide Aikokusha (Society of Patriots) to push for representative government in 1878. In 1881, in an action for which he is best known, Itagaki helped found the Jiyūtō (Liberal Party), which favored French political doctrines. In 1882 Ōkuma Shigenobu established the Rikken Kaishintō (Constitutional Progressive Party), which called for a British-style constitutional democracy. In response, government bureaucrats, local government officials, and other conservatives established the Rikken Teiseitō (Imperial Rule Party), a pro-government party, in 1882. Numerous political demonstrations followed, some of them violent, resulting in further government political restrictions. The restrictions hindered the political parties and led to divisiveness within and among them. The Jiyūtō, which had opposed the Kaishintō, was disbanded in 1884, and Ōkuma resigned as Kaishintō president.
 Links: a. Seikanron b. Ōkuma Shigenobu c. Itagaki Taisuke d. Aikoku Kōtō

Ex Output:
c


Ex Input:
Question: What album featured the Ashlee Simpson song that was in the top ten most popular songs on the iTunes store with A Public Affair? Passage:"A Public Affair" was released as the album's lead single on June 29, 2006. The song received mixed reviews from critics, with many criticizing its close similarity with "Holiday". The song also channeled Janet Jackson with its "breathy vocals, cheery, almost sickeningly sweet melody", and "mid-song giggle". The music video was shot on June 23, 2006 and the late evening of June 24, 2006 at the Moonlight Rollerway in Glendale, California. It features appearances by Christina Applegate, Christina Milian, Eva Longoria, Maria Menounos, Andy Dick and Ryan Seacrest. On July 19, Simpson visited Total Request Live to world premiere the video. In the chart Billboard Hot Videoclip Tracks peaked at the number 5. The single debuted at number thirty-nine on the US Billboard Hot 100 chart, Simpson's second highest debut after "These Boots Are Made for Walkin'". It had previously debuted at number twenty on Billboard's Bubbling Under Hot 100 Singles chart, which represents the twenty-five singles below the Hot 100's number 100 position that have not yet appeared on the Hot 100. Digital download sales were moderate until the release of the single's music video. In late July "A Public Affair" joined Ashlee Simpson's song "Invisible" in the top ten on the US iTunes Store's list of most popular songs, the first time in iTunes history that two siblings had different songs in the top ten. The song peaked in its fifth week on the Hot 100.
 Links: a. Invisible (Jaded Era song) b. Janet Jackson c. Andy Dick d. Christina Applegate

Ex Output:

a