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: In what year did the wrestler challenged by JBL first join the WWE? Passage:The main feud heading into Judgment Day 2006 involved Rey Mysterio and John "Bradshaw" Layfield (JBL) with the two battling over the World Heavyweight Championship. On the May 5 episode of SmackDown!, after Rey Mysterio expressed his feelings about being World Heavyweight Champion, John "Bradshaw" Layfield came out and declared himself the number-one contender. JBL immediately began degrading Mysterio because of his Mexican heritage, saying he was an illegal immigrant and that Mysterio doesn’t deserve to be champion. Mysterio reacted by saying that he'd fight anyone at any time. In turn, JBL announced that Mysterio would face off against Mark Henry later that night. During the match, Mysterio tried to use his quickness to avoid Henry, but was easily countered by Henry's power. Mysterio was able to hit a 619 and a Seated senton, but was defeated when Henry hit the World's Strongest Slam for the pin. The next week on SmackDown!, JBL announced that Mysterio would take on The Great Khali later that night. During the match, Mysterio attempted a springboard dropkick, but it had no effect. Khali then picked up Mysterio and hit a Two-handed chokeslam for the win. On the May 19 episode of SmackDown!, JBL said that Mysterio didn't look so well due to the beatings he endured in past weeks and that he probably didn't even know what day it was. Mysterio answered and told him the day, May 19. Kane, who in recent weeks attacked anyone who said May 19, came out and faced off against Mysterio. Kane dominated most of the match, hitting a variety of power moves. Kane then began to hear voices in his head saying May 19, which caused him to go into a psychotic trance. JBL told him to finish the job, but mistakenly said May 19, causing Kane to attack him. As a result, the match ended in a no-contest.
 Links: a. WWE SmackDown b. Powerslam c. Rey Mysterio d. Dropkick
Example Output: c

Example Input: Question: In what years was Blue Panther a wrestler for CMLL? Passage:Genaro Vazquez Nevarez, better known under the Ring name Blue Panther, made his professional wrestling debut on October 8, 1978. His first break came working for the Universal Wrestling Association in the early 1980s. In the UWA he won the UWA World Welterweight Championship, and the UWA World Junior Light Heavyweight Championship twice. He later moved on to Consejo Mundial de Lucha Libre (CMLL), the promotion he worked for, for most of his career. In CMLL he became involved in the storyline feud that would not only bring him to national and international attention but also helped cement his reputation as highly talented wrestler, a feud against "Love Machine" Art Barr, The feud spanned two promotions (CMLL and Asistencia Asesoría y Administración), included two high profile Lucha de Apuestas, or bet matches, where Blue Panther won the mask, and then the hair of Barr, as well as a long series of main event matches. In CMLL Blue Panther's won the CMLL World Middleweight Championship, the CMLL World Tag Team Championship with Atlantis, CMLL World Trios Championship twice, and the Mexican National Trios Championship twice. In 2007 he won the mask of Lizmark Jr., but lost his own mask the following year to Villano V. At his 35th Anniversary Show in 2013 Vazquez introduced two of his sons to the wrestling world, Blue Panther Jr. and Black Panther. For the 40th-anniversary show, Vazques was involved in booking two matches for the show, including creating the Copa Halcón Suriano in honor of his wrestling trainer.
 Links: a. CMLL World Tag Team Championship b. Blue Panther Jr. c. Consejo Mundial de Lucha Libre d. Lizmark Jr.
Example Output: c

Example Input: Question: What is the differnce in mass of the two planets that Kepler claimed to have had an epiphany after demonstrating their periodic conjunction in the zodiac? Passage:Kepler's first major astronomical work, Mysterium Cosmographicum (The Cosmographic Mystery, 1596), was the first published defense of the Copernican system. Kepler claimed to have had an epiphany on July 19, 1595, while teaching in Graz, demonstrating the periodic conjunction of Saturn and Jupiter in the zodiac: he realized that regular polygons bound one inscribed and one circumscribed circle at definite ratios, which, he reasoned, might be the geometrical basis of the universe. After failing to find a unique arrangement of polygons that fit known astronomical observations (even with extra planets added to the system), Kepler began experimenting with 3-dimensional polyhedra. He found that each of the five Platonic solids could be inscribed and circumscribed by spherical orbs; nesting these solids, each encased in a sphere, within one another would produce six layers, corresponding to the six known planets—Mercury, Venus, Earth, Mars, Jupiter, and Saturn. By ordering the solids selectively—octahedron, icosahedron, dodecahedron, tetrahedron, cube—Kepler found that the spheres could be placed at intervals corresponding to the relative sizes of each planet's path, assuming the planets circle the Sun. Kepler also found a formula relating the size of each planet's orb to the length of its orbital period: from inner to outer planets, the ratio of increase in orbital period is twice the difference in orb radius. However, Kepler later rejected this formula, because it was not precise enough.
 Links: a. Regular polygon b. Saturn c. Graz d. Saturn
Example Output:
b