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.

Example 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
Example Output: c

Example Input: Question: Who constructed the building that has been used as a health centre for the community, a school teaching kung fu, and a museum? Passage:From its southern end, Stone Nullah Lane begins at its junction with Lung On Street. This is where the Wan Chai Pak Tai Temple is located. Made from grey-coloured brick and granite, it was constructed in 1863, although the statue of Pak Tai inside dates even further back to 1604. The temple is the oldest in the district, and reportedly the largest on Hong Kong Island. The next landmark on the route is the headquarters of St. James' Settlement. Situated at 85 Stone Nullah Lane, the charitable organisation was established here in 1949 with the goal of helping impoverished children living in squats around the neighbourhood, and now extends its services to needy people across the city. The current structure towers 12-storeys above the lane. Before the street turns onto Queen's Road East and ends, it passes the Blue House, a Grade I historic building. The building—whose Spanish balconies made from cast-iron have elicited comparisons to ones in New Orleans—was built in the 1920s and was originally utilised as a health centre for the community, a school teaching kung fu from the 1950s to 1960s, and now houses a museum.
 Links: a. Blue House (Hong Kong) b. Queen's Road East c. Hong Kong Island d. Chinese martial arts
Example Output: a

Example Input: Question: What was Corey Seager's salary the year Culberson was signed to the Dodgers? Passage:Culberson was signed by the Dodgers in November 2015 and invited to spring training, where he impressed new Dodgers manager Dave Roberts. After an injury to Howie Kendrick opened a spot for him, Culberson made the Dodgers 2016 Opening Day roster. He was designated for assignment in July and optioned to the Oklahoma City Dodgers, then recalled a month later. Culberson ended the big club's final home game of the season with a walk-off home run against former Rockies teammate Boone Logan, clinching the Dodgers' fourth consecutive National League West division title. He played in 34 games for Los Angeles, hitting .284 and in 70 games for Oklahoma City, hitting .260. He had no hits in seven at-bats with two strikeouts in the 2016 National League Division Series. He was outrighted to the minors and removed from the 40-man roster on December 9, 2016. He was assigned to Oklahoma City to begin the season. He remained in the minors for the conclusion of the AAA season, hitting .250 in 108 games and returned to the majors with the Dodgers on September 4. In 15 games for the Dodgers, he hit .154 with two hits in 13 at-bats. When starting shortstop Corey Seager was left off of the 2017 NLCS roster because of a back injury, Culberson was added to the post-season roster. He appeared in all five games of the series, with five hits in 11 at-bats for a .455 average. In the 2017 World Series, Culberson had three hits in five at-bats, including his first career post-season home run, which he hit off Chris Devenski of the Houston Astros in the 11th inning of Game Two.
 Links: a. Dave Roberts (outfielder) b. Oklahoma City Dodgers c. Corey Seager d. Chris Devenski
Example Output:
c

